blob: c74d10c1ba70f6993c2685a8f426f93aece8a6f3 [file] [log] [blame]
Eric Andersen25f27032001-04-26 23:22:31 +00001/* vi: set sw=4 ts=4: */
2/*
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003 * A prototype Bourne shell grammar parser.
4 * Intended to follow the original Thompson and Ritchie
5 * "small and simple is beautiful" philosophy, which
6 * incidentally is a good match to today's BusyBox.
Eric Andersen25f27032001-04-26 23:22:31 +00007 *
8 * Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
Denis Vlasenkoc8d27332009-04-06 10:47:21 +00009 * Copyright (C) 2008,2009 Denys Vlasenko <vda.linux@googlemail.com>
Eric Andersen25f27032001-04-26 23:22:31 +000010 *
11 * Credits:
12 * The parser routines proper are all original material, first
Eric Andersencb81e642003-07-14 21:21:08 +000013 * written Dec 2000 and Jan 2001 by Larry Doolittle. The
14 * execution engine, the builtins, and much of the underlying
15 * support has been adapted from busybox-0.49pre's lash, which is
Eric Andersenc7bda1c2004-03-15 08:29:22 +000016 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
Eric Andersencb81e642003-07-14 21:21:08 +000017 * written by Erik Andersen <andersen@codepoet.org>. That, in turn,
18 * is based in part on ladsh.c, by Michael K. Johnson and Erik W.
19 * Troan, which they placed in the public domain. I don't know
20 * how much of the Johnson/Troan code has survived the repeated
21 * rewrites.
22 *
Eric Andersen25f27032001-04-26 23:22:31 +000023 * Other credits:
Denis Vlasenkoa8442002008-06-14 11:00:17 +000024 * o_addchr() derived from similar w_addchar function in glibc-2.2.
Eric Andersen25f27032001-04-26 23:22:31 +000025 * setup_redirect(), redirect_opt_num(), and big chunks of main()
Denis Vlasenko424f79b2009-03-22 14:23:34 +000026 * and many builtins derived from contributions by Erik Andersen.
27 * Miscellaneous bugfixes from Matt Kraai.
Eric Andersen25f27032001-04-26 23:22:31 +000028 *
29 * There are two big (and related) architecture differences between
30 * this parser and the lash parser. One is that this version is
31 * actually designed from the ground up to understand nearly all
32 * of the Bourne grammar. The second, consequential change is that
33 * the parser and input reader have been turned inside out. Now,
34 * the parser is in control, and asks for input as needed. The old
35 * way had the input reader in control, and it asked for parsing to
36 * take place as needed. The new way makes it much easier to properly
37 * handle the recursion implicit in the various substitutions, especially
38 * across continuation lines.
39 *
Mike Frysinger25a6ca02009-03-28 13:59:26 +000040 * POSIX syntax not implemented:
Eric Andersen78a7c992001-05-15 16:30:25 +000041 * aliases
Eric Andersen25f27032001-04-26 23:22:31 +000042 * <(list) and >(list) Process Substitution
Eric Andersen25f27032001-04-26 23:22:31 +000043 * Here Documents ( << word )
44 * Functions
Mike Frysinger25a6ca02009-03-28 13:59:26 +000045 * Tilde Expansion
Mike Frysinger6379bb42009-03-28 18:55:03 +000046 * Parameter Expansion for substring processing ${var#word} ${var%word}
Mike Frysinger25a6ca02009-03-28 13:59:26 +000047 *
Denis Vlasenkoc8d27332009-04-06 10:47:21 +000048 * Bash stuff (maybe optionally enable?):
Mike Frysinger25a6ca02009-03-28 13:59:26 +000049 * &> and >& redirection of stdout+stderr
50 * Brace expansion
51 * reserved words: [[ ]] function select
Mike Frysinger6379bb42009-03-28 18:55:03 +000052 * substrings ${var:1:5}
Mike Frysinger25a6ca02009-03-28 13:59:26 +000053 *
Denis Vlasenkoc8d27332009-04-06 10:47:21 +000054 * TODOs:
55 * grep for "TODO" and fix (some of them are easy)
Eric Andersen83a2ae22001-05-07 17:59:25 +000056 * change { and } from special chars to reserved words
Denis Vlasenkoc8d27332009-04-06 10:47:21 +000057 * builtins: return, ulimit
Eric Andersen25f27032001-04-26 23:22:31 +000058 * follow IFS rules more precisely, including update semantics
Eric Andersen25f27032001-04-26 23:22:31 +000059 * figure out what to do with backslash-newline
Eric Andersen25f27032001-04-26 23:22:31 +000060 * continuation lines, both explicit and implicit - done?
Denis Vlasenkoc8d27332009-04-06 10:47:21 +000061 * SIGHUP handling
62 * ^Z handling (and explain it in comments for mere humans)
63 * separate job control from interactiveness
64 * (testcase: booting with init=/bin/hush does not show prompt (2009-04))
65 * functions
Eric Andersen25f27032001-04-26 23:22:31 +000066 *
Bernhard Reutner-Fischer86f5c992006-01-22 22:55:11 +000067 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
Eric Andersen25f27032001-04-26 23:22:31 +000068 */
Bernhard Reutner-Fischere15d7572006-06-02 20:56:16 +000069
Denis Vlasenko1aa7e472007-11-28 06:49:03 +000070#include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */
Denis Vlasenko424f79b2009-03-22 14:23:34 +000071//TODO: pull in some .h and find out whether we have SINGLE_APPLET_MAIN?
Denis Vlasenko61befda2008-11-25 01:36:03 +000072//#include "applet_tables.h" doesn't work
Denis Vlasenkobe709c22008-07-28 00:01:16 +000073#include <glob.h>
74/* #include <dmalloc.h> */
75#if ENABLE_HUSH_CASE
76#include <fnmatch.h>
77#endif
Mike Frysinger98c52642009-04-02 10:02:37 +000078#include "math.h"
79
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +000080#ifdef WANT_TO_TEST_NOMMU
81# undef BB_MMU
82# undef USE_FOR_NOMMU
83# undef USE_FOR_MMU
84# define BB_MMU 0
85# define USE_FOR_NOMMU(...) __VA_ARGS__
86# define USE_FOR_MMU(...)
87#endif
88
Denis Vlasenko61befda2008-11-25 01:36:03 +000089#if defined SINGLE_APPLET_MAIN
90/* STANDALONE does not make sense, and won't compile */
91#undef CONFIG_FEATURE_SH_STANDALONE
92#undef ENABLE_FEATURE_SH_STANDALONE
93#undef USE_FEATURE_SH_STANDALONE
94#define SKIP_FEATURE_SH_STANDALONE(...) __VA_ARGS__
95#define ENABLE_FEATURE_SH_STANDALONE 0
96#define USE_FEATURE_SH_STANDALONE(...)
97#define SKIP_FEATURE_SH_STANDALONE(...) __VA_ARGS__
98#endif
99
Denis Vlasenko05743d72008-02-10 12:10:08 +0000100#if !ENABLE_HUSH_INTERACTIVE
101#undef ENABLE_FEATURE_EDITING
102#define ENABLE_FEATURE_EDITING 0
103#undef ENABLE_FEATURE_EDITING_FANCY_PROMPT
104#define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0
Denis Vlasenko8412d792007-10-01 09:59:47 +0000105#endif
106
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000107/* Do we support ANY keywords? */
108#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
109#define HAS_KEYWORDS 1
110#define IF_HAS_KEYWORDS(...) __VA_ARGS__
111#define IF_HAS_NO_KEYWORDS(...)
112#else
113#define HAS_KEYWORDS 0
114#define IF_HAS_KEYWORDS(...)
115#define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__
116#endif
Denis Vlasenko8412d792007-10-01 09:59:47 +0000117
Denis Vlasenko371de4a2008-10-14 12:43:13 +0000118/* Keep unconditionally on for now */
119#define HUSH_DEBUG 1
120/* In progress... */
121#define ENABLE_HUSH_FUNCTIONS 0
122
123
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000124/* If you comment out one of these below, it will be #defined later
125 * to perform debug printfs to stderr: */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000126#define debug_printf(...) do {} while (0)
Denis Vlasenko400c5b62007-05-04 13:07:27 +0000127/* Finer-grained debug switches */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000128#define debug_printf_parse(...) do {} while (0)
129#define debug_print_tree(a, b) do {} while (0)
130#define debug_printf_exec(...) do {} while (0)
Denis Vlasenkof886fd22008-10-13 12:36:05 +0000131#define debug_printf_env(...) do {} while (0)
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000132#define debug_printf_jobs(...) do {} while (0)
133#define debug_printf_expand(...) do {} while (0)
Denis Vlasenkob61e13d2008-06-17 05:11:43 +0000134#define debug_printf_glob(...) do {} while (0)
135#define debug_printf_list(...) do {} while (0)
Denis Vlasenko30c9cc52008-06-17 07:24:29 +0000136#define debug_printf_subst(...) do {} while (0)
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000137#define debug_printf_clean(...) do {} while (0)
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000138
139#ifndef debug_printf
140#define debug_printf(...) fprintf(stderr, __VA_ARGS__)
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000141#endif
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000142
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +0000143#ifndef debug_printf_parse
144#define debug_printf_parse(...) fprintf(stderr, __VA_ARGS__)
Denis Vlasenkod01ff132007-05-02 21:40:23 +0000145#endif
146
147#ifndef debug_printf_exec
148#define debug_printf_exec(...) fprintf(stderr, __VA_ARGS__)
149#endif
150
Denis Vlasenkof886fd22008-10-13 12:36:05 +0000151#ifndef debug_printf_env
152#define debug_printf_env(...) fprintf(stderr, __VA_ARGS__)
153#endif
154
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +0000155#ifndef debug_printf_jobs
156#define debug_printf_jobs(...) fprintf(stderr, __VA_ARGS__)
Denis Vlasenkob61e13d2008-06-17 05:11:43 +0000157#define DEBUG_JOBS 1
158#else
159#define DEBUG_JOBS 0
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +0000160#endif
161
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000162#ifndef debug_printf_expand
163#define debug_printf_expand(...) fprintf(stderr, __VA_ARGS__)
164#define DEBUG_EXPAND 1
Denis Vlasenkob61e13d2008-06-17 05:11:43 +0000165#else
166#define DEBUG_EXPAND 0
167#endif
168
169#ifndef debug_printf_glob
170#define debug_printf_glob(...) fprintf(stderr, __VA_ARGS__)
171#define DEBUG_GLOB 1
172#else
173#define DEBUG_GLOB 0
174#endif
175
176#ifndef debug_printf_list
177#define debug_printf_list(...) fprintf(stderr, __VA_ARGS__)
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000178#endif
179
Denis Vlasenko30c9cc52008-06-17 07:24:29 +0000180#ifndef debug_printf_subst
181#define debug_printf_subst(...) fprintf(stderr, __VA_ARGS__)
182#endif
183
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +0000184#ifndef debug_printf_clean
185/* broken, of course, but OK for testing */
186static const char *indenter(int i)
187{
Denis Vlasenko6ca409e2007-08-12 20:58:27 +0000188 static const char blanks[] ALIGN1 =
189 " ";
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +0000190 return &blanks[sizeof(blanks) - i - 1];
191}
192#define debug_printf_clean(...) fprintf(stderr, __VA_ARGS__)
Denis Vlasenkoc666f712007-05-16 22:18:54 +0000193#define DEBUG_CLEAN 1
Denis Vlasenkoa0e65122009-04-05 23:39:14 +0000194#else
195#define DEBUG_CLEAN 0
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +0000196#endif
197
Denis Vlasenkob61e13d2008-06-17 05:11:43 +0000198#if DEBUG_EXPAND
199static void debug_print_strings(const char *prefix, char **vv)
200{
201 fprintf(stderr, "%s:\n", prefix);
202 while (*vv)
203 fprintf(stderr, " '%s'\n", *vv++);
204}
205#else
206#define debug_print_strings(prefix, vv) ((void)0)
207#endif
208
Denis Vlasenkof962a032007-11-23 12:50:54 +0000209/*
210 * Leak hunting. Use hush_leaktool.sh for post-processing.
211 */
212#ifdef FOR_HUSH_LEAKTOOL
Denis Vlasenko6da69cd2009-04-04 12:12:58 +0000213static void *xxmalloc(int lineno, size_t size)
Denis Vlasenkof962a032007-11-23 12:50:54 +0000214{
215 void *ptr = xmalloc((size + 0xff) & ~0xff);
Denis Vlasenkob6e65562009-04-03 16:49:04 +0000216 fdprintf(2, "line %d: malloc %p\n", lineno, ptr);
Denis Vlasenkof962a032007-11-23 12:50:54 +0000217 return ptr;
218}
Denis Vlasenko6da69cd2009-04-04 12:12:58 +0000219static void *xxrealloc(int lineno, void *ptr, size_t size)
Denis Vlasenkof962a032007-11-23 12:50:54 +0000220{
221 ptr = xrealloc(ptr, (size + 0xff) & ~0xff);
Denis Vlasenkob6e65562009-04-03 16:49:04 +0000222 fdprintf(2, "line %d: realloc %p\n", lineno, ptr);
Denis Vlasenkof962a032007-11-23 12:50:54 +0000223 return ptr;
224}
Denis Vlasenko6da69cd2009-04-04 12:12:58 +0000225static char *xxstrdup(int lineno, const char *str)
Denis Vlasenkof962a032007-11-23 12:50:54 +0000226{
227 char *ptr = xstrdup(str);
Denis Vlasenkob6e65562009-04-03 16:49:04 +0000228 fdprintf(2, "line %d: strdup %p\n", lineno, ptr);
Denis Vlasenkof962a032007-11-23 12:50:54 +0000229 return ptr;
230}
Denis Vlasenko6da69cd2009-04-04 12:12:58 +0000231static void xxfree(void *ptr)
Denis Vlasenkof962a032007-11-23 12:50:54 +0000232{
Denis Vlasenkob6e65562009-04-03 16:49:04 +0000233 fdprintf(2, "free %p\n", ptr);
Denis Vlasenkof962a032007-11-23 12:50:54 +0000234 free(ptr);
235}
236#define xmalloc(s) xxmalloc(__LINE__, s)
237#define xrealloc(p, s) xxrealloc(__LINE__, p, s)
238#define xstrdup(s) xxstrdup(__LINE__, s)
239#define free(p) xxfree(p)
240#endif
241
242
Denis Vlasenkob6e65562009-04-03 16:49:04 +0000243#define ERR_PTR ((void*)(long)1)
244
Mike Frysinger258275d2009-04-05 21:19:43 +0000245static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="BB_VER;
Denis Vlasenko5ec61322008-06-24 00:50:07 +0000246
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000247#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
Denis Vlasenko5ec61322008-06-24 00:50:07 +0000248
Denis Vlasenkob6e65562009-04-03 16:49:04 +0000249#define SPECIAL_VAR_SYMBOL 3
Eric Andersen25f27032001-04-26 23:22:31 +0000250
Denis Vlasenkobcb25532008-07-28 23:04:34 +0000251typedef enum redir_type {
Eric Andersen25f27032001-04-26 23:22:31 +0000252 REDIRECT_INPUT = 1,
253 REDIRECT_OVERWRITE = 2,
254 REDIRECT_APPEND = 3,
255 REDIRECT_HEREIS = 4,
256 REDIRECT_IO = 5
257} redir_type;
258
Denis Vlasenko55789c62008-06-18 16:30:42 +0000259/* The descrip member of this structure is only used to make
260 * debugging output pretty */
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +0000261static const struct {
262 int mode;
Denis Vlasenkoef36ead2007-05-02 15:34:47 +0000263 signed char default_fd;
264 char descrip[3];
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +0000265} redir_table[] = {
Eric Andersen25f27032001-04-26 23:22:31 +0000266 { 0, 0, "()" },
267 { O_RDONLY, 0, "<" },
268 { O_CREAT|O_TRUNC|O_WRONLY, 1, ">" },
269 { O_CREAT|O_APPEND|O_WRONLY, 1, ">>" },
270 { O_RDONLY, -1, "<<" },
271 { O_RDWR, 1, "<>" }
272};
273
Denis Vlasenkobcb25532008-07-28 23:04:34 +0000274typedef enum reserved_style {
Eric Andersen25f27032001-04-26 23:22:31 +0000275 RES_NONE = 0,
Denis Vlasenko06810332007-05-21 23:30:54 +0000276#if ENABLE_HUSH_IF
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000277 RES_IF ,
278 RES_THEN ,
279 RES_ELIF ,
280 RES_ELSE ,
281 RES_FI ,
Denis Vlasenko06810332007-05-21 23:30:54 +0000282#endif
283#if ENABLE_HUSH_LOOPS
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000284 RES_FOR ,
285 RES_WHILE ,
286 RES_UNTIL ,
287 RES_DO ,
288 RES_DONE ,
Denis Vlasenkod91afa32008-07-29 11:10:01 +0000289#endif
290#if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000291 RES_IN ,
Denis Vlasenko06810332007-05-21 23:30:54 +0000292#endif
Denis Vlasenko17f02e72008-07-14 04:32:29 +0000293#if ENABLE_HUSH_CASE
294 RES_CASE ,
295 /* two pseudo-keywords support contrived "case" syntax: */
296 RES_MATCH , /* "word)" */
297 RES_CASEI , /* "this command is inside CASE" */
298 RES_ESAC ,
299#endif
300 RES_XXXX ,
301 RES_SNTX
Eric Andersen25f27032001-04-26 23:22:31 +0000302} reserved_style;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +0000303
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000304typedef struct o_string {
305 char *data;
306 int length; /* position where data is appended */
307 int maxlen;
308 /* Protect newly added chars against globbing
309 * (by prepending \ to *, ?, [, \) */
310 smallint o_escape;
311 smallint o_glob;
312 smallint nonnull;
313 smallint has_empty_slot;
314 smallint o_assignment; /* 0:maybe, 1:yes, 2:no */
315} o_string;
316enum {
317 MAYBE_ASSIGNMENT = 0,
318 DEFINITELY_ASSIGNMENT = 1,
319 NOT_ASSIGNMENT = 2,
320 WORD_IS_KEYWORD = 3, /* not assigment, but next word may be: "if v=xyz cmd;" */
321};
322/* Used for initialization: o_string foo = NULL_O_STRING; */
323#define NULL_O_STRING { NULL }
324
325/* I can almost use ordinary FILE*. Is open_memstream() universally
326 * available? Where is it documented? */
327typedef struct in_str {
328 const char *p;
329 /* eof_flag=1: last char in ->p is really an EOF */
330 char eof_flag; /* meaningless if ->p == NULL */
331 char peek_buf[2];
332#if ENABLE_HUSH_INTERACTIVE
333 smallint promptme;
334 smallint promptmode; /* 0: PS1, 1: PS2 */
335#endif
336 FILE *file;
337 int (*get) (struct in_str *);
338 int (*peek) (struct in_str *);
339} in_str;
340#define i_getch(input) ((input)->get(input))
341#define i_peek(input) ((input)->peek(input))
342
Eric Andersen25f27032001-04-26 23:22:31 +0000343struct redir_struct {
Denis Vlasenko55789c62008-06-18 16:30:42 +0000344 struct redir_struct *next;
Denis Vlasenko5ec61322008-06-24 00:50:07 +0000345 char *rd_filename; /* filename */
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000346 int fd; /* file descriptor being redirected */
347 int dup; /* -1, or file descriptor being duplicated */
Denis Vlasenko5ec61322008-06-24 00:50:07 +0000348 smallint /*enum redir_type*/ rd_type;
Eric Andersen25f27032001-04-26 23:22:31 +0000349};
350
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000351struct command {
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000352 pid_t pid; /* 0 if exited */
Denis Vlasenko2b576b82008-08-04 00:46:07 +0000353 int assignment_cnt; /* how many argv[i] are assignments? */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000354 smallint is_stopped; /* is the command currently running? */
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000355 smallint grp_type; /* GRP_xxx */
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000356 struct pipe *group; /* if non-NULL, this "command" is { list },
357 * ( list ), or a compound statement */
358#if !BB_MMU
359 char *group_as_string;
360#endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000361 char **argv; /* command name and arguments */
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000362 struct redir_struct *redirects; /* I/O redirections */
Eric Andersen25f27032001-04-26 23:22:31 +0000363};
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000364/* argv vector may contain variable references (^Cvar^C, ^C0^C etc)
365 * and on execution these are substituted with their values.
366 * Substitution can make _several_ words out of one argv[n]!
367 * Example: argv[0]=='.^C*^C.' here: echo .$*.
Denis Vlasenkoc7985b72008-06-17 05:43:38 +0000368 * References of the form ^C`cmd arg^C are `cmd arg` substitutions.
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +0000369 */
Denis Vlasenko371de4a2008-10-14 12:43:13 +0000370#define GRP_NORMAL 0
371#define GRP_SUBSHELL 1
372#if ENABLE_HUSH_FUNCTIONS
373#define GRP_FUNCTION 2
374#endif
Eric Andersen25f27032001-04-26 23:22:31 +0000375
376struct pipe {
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000377 struct pipe *next;
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000378 int num_cmds; /* total number of commands in job */
379 int alive_cmds; /* number of commands running (not exited) */
380 int stopped_cmds; /* number of commands alive, but stopped */
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000381#if ENABLE_HUSH_JOB
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000382 int jobid; /* job number */
Denis Vlasenko0c886c62007-01-30 22:30:09 +0000383 pid_t pgrp; /* process group ID for the job */
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000384 char *cmdtext; /* name of job */
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000385#endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000386 struct command *cmds; /* array of commands in pipe */
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000387 smallint followup; /* PIPE_BG, PIPE_SEQ, PIPE_OR, PIPE_AND */
Denis Vlasenko5ec61322008-06-24 00:50:07 +0000388 IF_HAS_KEYWORDS(smallint pi_inverted;) /* "! cmd | cmd" */
389 IF_HAS_KEYWORDS(smallint res_word;) /* needed for if, for, while, until... */
Eric Andersen25f27032001-04-26 23:22:31 +0000390};
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +0000391typedef enum pipe_style {
392 PIPE_SEQ = 1,
393 PIPE_AND = 2,
394 PIPE_OR = 3,
395 PIPE_BG = 4,
396} pipe_style;
Eric Andersen25f27032001-04-26 23:22:31 +0000397
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000398/* This holds pointers to the various results of parsing */
399struct parse_context {
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000400 /* linked list of pipes */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000401 struct pipe *list_head;
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000402 /* last pipe (being constructed right now) */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000403 struct pipe *pipe;
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000404 /* last command in pipe (being constructed right now) */
405 struct command *command;
406 /* last redirect in command->redirects list */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000407 struct redir_struct *pending_redirect;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +0000408#if !BB_MMU
409 o_string as_string;
410#endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000411#if HAS_KEYWORDS
412 smallint ctx_res_w;
413 smallint ctx_inverted; /* "! cmd | cmd" */
414#if ENABLE_HUSH_CASE
415 smallint ctx_dsemicolon; /* ";;" seen */
416#endif
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000417 /* bitmask of FLAG_xxx, for figuring out valid reserved words */
418 int old_flag;
419 /* group we are enclosed in:
Denis Vlasenko34d4d892009-04-04 20:24:37 +0000420 * example: "if pipe1; pipe2; then pipe3; fi"
421 * when we see "if" or "then", we malloc and copy current context,
422 * and make ->stack point to it. then we parse pipeN.
423 * when closing "then" / fi" / whatever is found,
424 * we move list_head into ->stack->command->group,
425 * copy ->stack into current context, and delete ->stack.
426 * (parsing of { list } and ( list ) doesn't use this method)
Denis Vlasenkof9f74292009-04-03 00:07:05 +0000427 */
Denis Vlasenko9af22c72008-10-09 12:54:58 +0000428 struct parse_context *stack;
429#endif
430};
431
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000432/* On program start, environ points to initial environment.
433 * putenv adds new pointers into it, unsetenv removes them.
434 * Neither of these (de)allocates the strings.
435 * setenv allocates new strings in malloc space and does putenv,
436 * and thus setenv is unusable (leaky) for shell's purposes */
437#define setenv(...) setenv_is_leaky_dont_use()
438struct variable {
439 struct variable *next;
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +0000440 char *varstr; /* points to "name=" portion */
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000441 int max_len; /* if > 0, name is part of initial env; else name is malloced */
442 smallint flg_export; /* putenv should be done on this var */
Denis Vlasenko219e88d2007-05-21 10:18:23 +0000443 smallint flg_read_only;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000444};
445
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000446enum {
Denis Vlasenkobcb25532008-07-28 23:04:34 +0000447 BC_BREAK = 1,
448 BC_CONTINUE = 2,
449};
450
Denis Vlasenkod76c0492007-05-25 02:16:25 +0000451
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000452/* "Globals" within this file */
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000453/* Sorted roughly by size (smaller offsets == smaller code) */
454struct globals {
455#if ENABLE_HUSH_INTERACTIVE
456 /* 'interactive_fd' is a fd# open to ctty, if we have one
457 * _AND_ if we decided to act interactively */
458 int interactive_fd;
459 const char *PS1;
460 const char *PS2;
Denis Vlasenko60b392f2009-04-03 19:14:32 +0000461#define G_interactive_fd (G.interactive_fd)
462#else
463#define G_interactive_fd 0
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000464#endif
465#if ENABLE_FEATURE_EDITING
466 line_input_t *line_input_state;
467#endif
Denis Vlasenkocc3f20b2008-06-23 22:31:52 +0000468 pid_t root_pid;
Denis Vlasenko87a86552008-07-29 19:43:10 +0000469 pid_t last_bg_pid;
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000470#if ENABLE_HUSH_JOB
471 int run_list_level;
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000472 pid_t saved_tty_pgrp;
473 int last_jobid;
474 struct pipe *job_list;
475 struct pipe *toplevel_list;
Denis Vlasenkod5762932009-03-31 11:22:57 +0000476//// smallint ctrl_z_flag;
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000477#endif
Denis Vlasenko422cd7c2009-03-31 12:41:52 +0000478 smallint flag_SIGINT;
Denis Vlasenkodadfb492008-07-29 10:16:05 +0000479#if ENABLE_HUSH_LOOPS
Denis Vlasenkobcb25532008-07-28 23:04:34 +0000480 smallint flag_break_continue;
Denis Vlasenkodadfb492008-07-29 10:16:05 +0000481#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000482 smallint fake_mode;
Denis Vlasenkod5762932009-03-31 11:22:57 +0000483 /* These four support $?, $#, and $1 */
Denis Vlasenko5e052ca2008-07-28 15:15:09 +0000484 smalluint last_return_code;
Denis Vlasenkocc4c6932009-04-05 07:38:48 +0000485 /* are global_argv and global_argv[1..n] malloced? (note: not [0]) */
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +0000486 smalluint global_args_malloced;
Denis Vlasenkoe1300f62009-03-22 11:41:18 +0000487 /* how many non-NULL argv's we have. NB: $# + 1 */
488 int global_argc;
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000489 char **global_argv;
Denis Vlasenkocc4c6932009-04-05 07:38:48 +0000490#if !BB_MMU
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +0000491 char *argv0_for_re_execing;
492 char **argv_from_re_execing;
Denis Vlasenkocc4c6932009-04-05 07:38:48 +0000493#endif
Denis Vlasenkodadfb492008-07-29 10:16:05 +0000494#if ENABLE_HUSH_LOOPS
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +0000495 unsigned depth_break_continue;
Denis Vlasenkofcf37c32008-07-29 11:37:15 +0000496 unsigned depth_of_loop;
Denis Vlasenkodadfb492008-07-29 10:16:05 +0000497#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000498 const char *ifs;
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000499 const char *cwd;
Denis Vlasenko87a86552008-07-29 19:43:10 +0000500 struct variable *top_var; /* = &G.shell_ver (set in main()) */
Denis Vlasenko0a83fc32007-05-25 11:12:32 +0000501 struct variable shell_ver;
Denis Vlasenkod5762932009-03-31 11:22:57 +0000502 /* Signal and trap handling */
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000503// unsigned count_SIGCHLD;
504// unsigned handled_SIGCHLD;
Denis Vlasenkod5762932009-03-31 11:22:57 +0000505 /* which signals have non-DFL handler (even with no traps set)? */
506 unsigned non_DFL_mask;
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000507 char **traps; /* char *traps[NSIG] */
Denis Vlasenkod5762932009-03-31 11:22:57 +0000508 sigset_t blocked_set;
509 sigset_t inherited_set;
Denis Vlasenko6da69cd2009-04-04 12:12:58 +0000510 char user_input_buf[ENABLE_FEATURE_EDITING ? BUFSIZ : 2];
511#if ENABLE_FEATURE_SH_STANDALONE
512 struct nofork_save_area nofork_save;
513#endif
514#if ENABLE_HUSH_JOB
515 sigjmp_buf toplevel_jb;
516#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000517};
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000518#define G (*ptr_to_globals)
Denis Vlasenko87a86552008-07-29 19:43:10 +0000519/* Not #defining name to G.name - this quickly gets unwieldy
520 * (too many defines). Also, I actually prefer to see when a variable
521 * is global, thus "G." prefix is a useful hint */
Denis Vlasenko574f2f42008-02-27 18:41:59 +0000522#define INIT_G() do { \
523 SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
524} while (0)
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000525
526
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000527/* Function prototypes for builtins */
528static int builtin_cd(char **argv);
529static int builtin_echo(char **argv);
530static int builtin_eval(char **argv);
531static int builtin_exec(char **argv);
532static int builtin_exit(char **argv);
533static int builtin_export(char **argv);
534#if ENABLE_HUSH_JOB
535static int builtin_fg_bg(char **argv);
536static int builtin_jobs(char **argv);
537#endif
538#if ENABLE_HUSH_HELP
539static int builtin_help(char **argv);
540#endif
541static int builtin_pwd(char **argv);
542static int builtin_read(char **argv);
543static int builtin_test(char **argv);
Mike Frysinger9f8128f2009-03-29 23:49:37 +0000544static int builtin_trap(char **argv);
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000545static int builtin_true(char **argv);
546static int builtin_set(char **argv);
547static int builtin_shift(char **argv);
548static int builtin_source(char **argv);
549static int builtin_umask(char **argv);
550static int builtin_unset(char **argv);
Mike Frysinger56bdea12009-03-28 20:01:58 +0000551static int builtin_wait(char **argv);
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000552#if ENABLE_HUSH_LOOPS
553static int builtin_break(char **argv);
554static int builtin_continue(char **argv);
555#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000556
557/* Table of built-in functions. They can be forked or not, depending on
558 * context: within pipes, they fork. As simple commands, they do not.
559 * When used in non-forking context, they can change global variables
560 * in the parent shell process. If forked, of course they cannot.
561 * For example, 'unset foo | whatever' will parse and run, but foo will
562 * still be set at the end. */
563struct built_in_command {
564 const char *cmd;
565 int (*function)(char **argv);
566#if ENABLE_HUSH_HELP
567 const char *descr;
568#define BLTIN(cmd, func, help) { cmd, func, help }
569#else
570#define BLTIN(cmd, func, help) { cmd, func }
571#endif
572};
573
574/* For now, echo and test are unconditionally enabled.
575 * Maybe make it configurable? */
576static const struct built_in_command bltins[] = {
Denis Vlasenko34d4d892009-04-04 20:24:37 +0000577 BLTIN("." , builtin_source , "Run commands in a file"),
578 BLTIN(":" , builtin_true , "No-op"),
579 BLTIN("[" , builtin_test , "Test condition"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000580#if ENABLE_HUSH_JOB
Denis Vlasenko34d4d892009-04-04 20:24:37 +0000581 BLTIN("bg" , builtin_fg_bg , "Resume a job in the background"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000582#endif
583#if ENABLE_HUSH_LOOPS
Denis Vlasenko34d4d892009-04-04 20:24:37 +0000584 BLTIN("break" , builtin_break , "Exit from a loop"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000585#endif
Denis Vlasenko34d4d892009-04-04 20:24:37 +0000586 BLTIN("cd" , builtin_cd , "Change directory"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000587#if ENABLE_HUSH_LOOPS
588 BLTIN("continue", builtin_continue, "Start new loop iteration"),
589#endif
Denis Vlasenko34d4d892009-04-04 20:24:37 +0000590 BLTIN("echo" , builtin_echo , "Write to stdout"),
591 BLTIN("eval" , builtin_eval , "Construct and run shell command"),
592 BLTIN("exec" , builtin_exec , "Execute command, don't return to shell"),
593 BLTIN("exit" , builtin_exit , "Exit"),
594 BLTIN("export" , builtin_export , "Set environment variable"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000595#if ENABLE_HUSH_JOB
Denis Vlasenko34d4d892009-04-04 20:24:37 +0000596 BLTIN("fg" , builtin_fg_bg , "Bring job into the foreground"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000597#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000598#if ENABLE_HUSH_HELP
Denis Vlasenko34d4d892009-04-04 20:24:37 +0000599 BLTIN("help" , builtin_help , "List shell built-in commands"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000600#endif
Denis Vlasenko34d4d892009-04-04 20:24:37 +0000601#if ENABLE_HUSH_JOB
602 BLTIN("jobs" , builtin_jobs , "List active jobs"),
603#endif
604 BLTIN("pwd" , builtin_pwd , "Print current directory"),
605 BLTIN("read" , builtin_read , "Input environment variable"),
606// BLTIN("return" , builtin_return , "Return from a function"),
607 BLTIN("set" , builtin_set , "Set/unset shell local variables"),
608 BLTIN("shift" , builtin_shift , "Shift positional parameters"),
609 BLTIN("test" , builtin_test , "Test condition"),
610 BLTIN("trap" , builtin_trap , "Trap signals"),
611// BLTIN("ulimit" , builtin_return , "Control resource limits"),
612 BLTIN("umask" , builtin_umask , "Set file creation mask"),
613 BLTIN("unset" , builtin_unset , "Unset environment variable"),
614 BLTIN("wait" , builtin_wait , "Wait for process"),
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000615};
616
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +0000617
Mike Frysinger6379bb42009-03-28 18:55:03 +0000618static void maybe_die(const char *notice, const char *msg)
Denis Vlasenko90e485c2007-05-23 15:22:50 +0000619{
Denis Vlasenko5a1437d2007-05-24 13:22:47 +0000620 /* Was using fancy stuff:
Denis Vlasenko60b392f2009-04-03 19:14:32 +0000621 * (G_interactive_fd ? bb_error_msg : bb_error_msg_and_die)(...params...)
Denis Vlasenko5a1437d2007-05-24 13:22:47 +0000622 * but it SEGVs. ?! Oh well... explicit temp ptr works around that */
Mike Frysinger6379bb42009-03-28 18:55:03 +0000623 void FAST_FUNC (*fp)(const char *s, ...) = bb_error_msg_and_die;
624#if ENABLE_HUSH_INTERACTIVE
Mike Frysingerdfa9de72009-04-03 22:48:10 +0000625 if (G_interactive_fd)
626 fp = bb_error_msg;
Denis Vlasenko87a86552008-07-29 19:43:10 +0000627#endif
Mike Frysinger6379bb42009-03-28 18:55:03 +0000628 fp(msg ? "%s: %s" : notice, notice, msg);
629}
Mike Frysinger5a828452009-03-28 19:09:04 +0000630#if 1
631#define syntax(msg) maybe_die("syntax error", msg);
Denis Vlasenko90e485c2007-05-23 15:22:50 +0000632#else
Mike Frysinger5a828452009-03-28 19:09:04 +0000633/* Debug -- trick gcc to expand __LINE__ and convert to string */
634#define __syntax(msg, line) maybe_die("syntax error hush.c:" # line, msg)
635#define _syntax(msg, line) __syntax(msg, line)
636#define syntax(msg) _syntax(msg, __LINE__)
Denis Vlasenko90e485c2007-05-23 15:22:50 +0000637#endif
Eric Andersen25f27032001-04-26 23:22:31 +0000638
Denis Vlasenko552433b2009-04-04 19:29:21 +0000639
Denis Vlasenkob61e13d2008-06-17 05:11:43 +0000640static int glob_needed(const char *s)
641{
642 while (*s) {
643 if (*s == '\\')
644 s++;
645 if (*s == '*' || *s == '[' || *s == '?')
646 return 1;
647 s++;
648 }
649 return 0;
650}
651
Denis Vlasenko30c9cc52008-06-17 07:24:29 +0000652static int is_assignment(const char *s)
653{
Denis Vlasenkod4981312008-07-31 10:34:48 +0000654 if (!s || !(isalpha(*s) || *s == '_'))
Denis Vlasenko30c9cc52008-06-17 07:24:29 +0000655 return 0;
656 s++;
657 while (isalnum(*s) || *s == '_')
658 s++;
659 return *s == '=';
660}
661
Denis Vlasenko55789c62008-06-18 16:30:42 +0000662/* Replace each \x with x in place, return ptr past NUL. */
663static char *unbackslash(char *src)
664{
665 char *dst = src;
666 while (1) {
667 if (*src == '\\')
668 src++;
669 if ((*dst++ = *src++) == '\0')
670 break;
671 }
672 return dst;
673}
674
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +0000675static char **add_strings_to_strings(char **strings, char **add, int need_to_dup)
Denis Vlasenkod65ea392007-10-01 10:02:25 +0000676{
677 int i;
678 unsigned count1;
679 unsigned count2;
680 char **v;
681
682 v = strings;
683 count1 = 0;
684 if (v) {
685 while (*v) {
686 count1++;
687 v++;
688 }
689 }
690 count2 = 0;
691 v = add;
692 while (*v) {
693 count2++;
694 v++;
695 }
696 v = xrealloc(strings, (count1 + count2 + 1) * sizeof(char*));
697 v[count1 + count2] = NULL;
698 i = count2;
699 while (--i >= 0)
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +0000700 v[count1 + i] = (need_to_dup ? xstrdup(add[i]) : add[i]);
Denis Vlasenkod65ea392007-10-01 10:02:25 +0000701 return v;
702}
703
Denis Vlasenko22d10a02008-10-13 08:53:43 +0000704static char **add_string_to_strings(char **strings, char *add)
Denis Vlasenkod65ea392007-10-01 10:02:25 +0000705{
706 char *v[2];
Denis Vlasenkod65ea392007-10-01 10:02:25 +0000707 v[0] = add;
708 v[1] = NULL;
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +0000709 return add_strings_to_strings(strings, v, /*dup:*/ 0);
Denis Vlasenko22d10a02008-10-13 08:53:43 +0000710}
Denis Vlasenkod65ea392007-10-01 10:02:25 +0000711
Denis Vlasenko22d10a02008-10-13 08:53:43 +0000712static void putenv_all(char **strings)
713{
714 if (!strings)
715 return;
Denis Vlasenkof886fd22008-10-13 12:36:05 +0000716 while (*strings) {
717 debug_printf_env("putenv '%s'\n", *strings);
Denis Vlasenko22d10a02008-10-13 08:53:43 +0000718 putenv(*strings++);
Denis Vlasenkof886fd22008-10-13 12:36:05 +0000719 }
Denis Vlasenko22d10a02008-10-13 08:53:43 +0000720}
721
722static char **putenv_all_and_save_old(char **strings)
723{
724 char **old = NULL;
725 char **s = strings;
726
727 if (!strings)
728 return old;
729 while (*strings) {
Denis Vlasenkof886fd22008-10-13 12:36:05 +0000730 char *v, *eq;
731
732 eq = strchr(*strings, '=');
733 if (eq) {
734 *eq = '\0';
735 v = getenv(*strings);
736 *eq = '=';
737 if (v) {
738 /* v points to VAL in VAR=VAL, go back to VAR */
739 v -= (eq - *strings) + 1;
740 old = add_string_to_strings(old, v);
741 }
742 }
743 strings++;
Denis Vlasenko22d10a02008-10-13 08:53:43 +0000744 }
745 putenv_all(s);
746 return old;
Denis Vlasenkod65ea392007-10-01 10:02:25 +0000747}
748
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +0000749static void free_strings_and_unsetenv(char **strings, int unset)
Denis Vlasenkod65ea392007-10-01 10:02:25 +0000750{
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +0000751 char **v;
752
753 if (!strings)
754 return;
755
756 v = strings;
757 while (*v) {
758 if (unset) {
Denis Vlasenko76ddc2e2008-12-30 05:05:31 +0000759 debug_printf_env("unsetenv '%s'\n", *v);
760 bb_unsetenv(*v);
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +0000761 }
762 free(*v++);
Denis Vlasenkod65ea392007-10-01 10:02:25 +0000763 }
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +0000764 free(strings);
Denis Vlasenkod65ea392007-10-01 10:02:25 +0000765}
766
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +0000767static void free_strings(char **strings)
Denis Vlasenko76d50412008-06-10 16:19:39 +0000768{
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +0000769 free_strings_and_unsetenv(strings, 0);
Denis Vlasenko76d50412008-06-10 16:19:39 +0000770}
Denis Vlasenko76d50412008-06-10 16:19:39 +0000771
772
Denis Vlasenkod5762932009-03-31 11:22:57 +0000773/* Basic theory of signal handling in shell
774 * ========================================
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000775 * This does not describe what hush does, rather, it is current understanding
776 * what it _should_ do. If it doesn't, it's a bug.
Denis Vlasenkod5762932009-03-31 11:22:57 +0000777 * http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#trap
778 *
779 * Signals are handled only after each pipe ("cmd | cmd | cmd" thing)
780 * is finished or backgrounded. It is the same in interactive and
781 * non-interactive shells, and is the same regardless of whether
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000782 * a user trap handler is installed or a shell special one is in effect.
Denis Vlasenkod5762932009-03-31 11:22:57 +0000783 * ^C or ^Z from keyboard seem to execute "at once" because it usually
784 * backgrounds (i.e. stops) or kills all members of currently running
785 * pipe.
786 *
787 * Wait builtin in interruptible by signals for which user trap is set
788 * or by SIGINT in interactive shell.
789 *
790 * Trap handlers will execute even within trap handlers. (right?)
791 *
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000792 * User trap handlers are forgotten when subshell ("(cmd)") is entered. [TODO]
Denis Vlasenkod5762932009-03-31 11:22:57 +0000793 *
794 * If job control is off, backgrounded commands ("cmd &")
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000795 * have SIGINT, SIGQUIT set to SIG_IGN.
Denis Vlasenkod5762932009-03-31 11:22:57 +0000796 *
797 * Commands run in command substitution ("`cmd`")
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000798 * have SIGTTIN, SIGTTOU, SIGTSTP set to SIG_IGN.
Denis Vlasenkod5762932009-03-31 11:22:57 +0000799 *
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000800 * Ordinary commands have signals set to SIG_IGN/DFL set as inherited
801 * by the shell from its parent.
Denis Vlasenkod5762932009-03-31 11:22:57 +0000802 *
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000803 * Siganls which differ from SIG_DFL action
804 * (note: child (i.e., [v]forked) shell is not an interactive shell):
Denis Vlasenkod5762932009-03-31 11:22:57 +0000805 *
806 * SIGQUIT: ignore
807 * SIGTERM (interactive): ignore
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000808 * SIGHUP (interactive):
809 * send SIGCONT to stopped jobs, send SIGHUP to all jobs and exit
Denis Vlasenkod5762932009-03-31 11:22:57 +0000810 * SIGTTIN, SIGTTOU, SIGTSTP (if job control is on): ignore
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000811 * (note that ^Z is handled not by trapping SIGTSTP, but by seeing
812 * that all pipe members are stopped) (right?)
Denis Vlasenkod5762932009-03-31 11:22:57 +0000813 * SIGINT (interactive): wait for last pipe, ignore the rest
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000814 * of the command line, show prompt. NB: ^C does not send SIGINT
815 * to interactive shell while shell is waiting for a pipe,
816 * since shell is bg'ed (is not in foreground process group).
817 * (check/expand this)
818 * Example 1: this waits 5 sec, but does not execute ls:
819 * "echo $$; sleep 5; ls -l" + "kill -INT <pid>"
820 * Example 2: this does not wait and does not execute ls:
821 * "echo $$; sleep 5 & wait; ls -l" + "kill -INT <pid>"
822 * Example 3: this does not wait 5 sec, but executes ls:
823 * "sleep 5; ls -l" + press ^C
Denis Vlasenkod5762932009-03-31 11:22:57 +0000824 *
825 * (What happens to signals which are IGN on shell start?)
826 * (What happens with signal mask on shell start?)
827 *
828 * Implementation in hush
829 * ======================
830 * We use in-kernel pending signal mask to determine which signals were sent.
831 * We block all signals which we don't want to take action immediately,
832 * i.e. we block all signals which need to have special handling as described
833 * above, and all signals which have traps set.
834 * After each pipe execution, we extract any pending signals via sigtimedwait()
835 * and act on them.
836 *
837 * unsigned non_DFL_mask: a mask of such "special" signals
838 * sigset_t blocked_set: current blocked signal set
839 *
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000840 * "trap - SIGxxx":
Denis Vlasenko552433b2009-04-04 19:29:21 +0000841 * clear bit in blocked_set unless it is also in non_DFL_mask
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000842 * "trap 'cmd' SIGxxx":
843 * set bit in blocked_set (even if 'cmd' is '')
Denis Vlasenkod5762932009-03-31 11:22:57 +0000844 * after [v]fork, if we plan to be a shell:
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000845 * nothing for {} child shell (say, "true | { true; true; } | true")
846 * unset all traps if () shell. [TODO]
Denis Vlasenkod5762932009-03-31 11:22:57 +0000847 * after [v]fork, if we plan to exec:
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000848 * POSIX says pending signal mask is cleared in child - no need to clear it.
849 * Restore blocked signal set to one inherited by shell just prior to exec.
Denis Vlasenkod5762932009-03-31 11:22:57 +0000850 *
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000851 * Note: as a result, we do not use signal handlers much. The only uses
852 * are to count SIGCHLDs [disabled - bug somewhere, + bloat]
853 * and to restore tty pgrp on signal-induced exit.
Denis Vlasenkod5762932009-03-31 11:22:57 +0000854 */
855
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000856//static void SIGCHLD_handler(int sig UNUSED_PARAM)
857//{
858// G.count_SIGCHLD++;
859//}
860
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000861static int check_and_run_traps(int sig)
Denis Vlasenkod5762932009-03-31 11:22:57 +0000862{
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000863 static const struct timespec zero_timespec = { 0, 0 };
Denis Vlasenkod5762932009-03-31 11:22:57 +0000864 smalluint save_rcode;
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000865 int last_sig = 0;
Denis Vlasenkod5762932009-03-31 11:22:57 +0000866
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000867 if (sig)
868 goto jump_in;
Denis Vlasenkod5762932009-03-31 11:22:57 +0000869 while (1) {
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000870 sig = sigtimedwait(&G.blocked_set, NULL, &zero_timespec);
Denis Vlasenkod5762932009-03-31 11:22:57 +0000871 if (sig <= 0)
872 break;
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000873 jump_in:
874 last_sig = sig;
Denis Vlasenkod5762932009-03-31 11:22:57 +0000875 if (G.traps && G.traps[sig]) {
876 if (G.traps[sig][0]) {
877 /* We have user-defined handler */
878 char *argv[] = { NULL, xstrdup(G.traps[sig]), NULL };
879 save_rcode = G.last_return_code;
880 builtin_eval(argv);
881 free(argv[1]);
882 G.last_return_code = save_rcode;
883 } /* else: "" trap, ignoring signal */
884 continue;
885 }
886 /* not a trap: special action */
Denis Vlasenkod5762932009-03-31 11:22:57 +0000887 switch (sig) {
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000888// case SIGCHLD:
889// G.count_SIGCHLD++;
890// break;
Denis Vlasenko422cd7c2009-03-31 12:41:52 +0000891 case SIGINT:
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000892 bb_putchar('\n');
Denis Vlasenko422cd7c2009-03-31 12:41:52 +0000893 G.flag_SIGINT = 1;
Denis Vlasenkod5762932009-03-31 11:22:57 +0000894 break;
Denis Vlasenko422cd7c2009-03-31 12:41:52 +0000895//TODO
896// case SIGHUP: ...
897// break;
Denis Vlasenkod3f973e2009-04-06 10:21:42 +0000898 default: /* ignored: */
899 /* SIGTERM, SIGQUIT, SIGTTIN, SIGTTOU, SIGTSTP */
Denis Vlasenko422cd7c2009-03-31 12:41:52 +0000900 break;
Denis Vlasenkod5762932009-03-31 11:22:57 +0000901 }
Denis Vlasenkod5762932009-03-31 11:22:57 +0000902 }
Denis Vlasenko7566bae2009-03-31 17:24:49 +0000903 return last_sig;
Denis Vlasenkod5762932009-03-31 11:22:57 +0000904}
905
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +0000906#if ENABLE_HUSH_JOB
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000907/* Restores tty foreground process group, and exits.
908 * May be called as signal handler for fatal signal
909 * (will faithfully resend signal to itself, producing correct exit state)
910 * or called directly with -EXITCODE.
911 * We also call it if xfunc is exiting. */
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +0000912static void sigexit(int sig) NORETURN;
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000913static void sigexit(int sig)
914{
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000915 /* Disable all signals: job control, SIGPIPE, etc. */
Denis Vlasenko3f165fa2008-03-17 08:29:08 +0000916 sigprocmask_allsigs(SIG_BLOCK);
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000917
Denis Vlasenkoabedaac2009-03-31 12:03:40 +0000918 /* Careful: we can end up here after [v]fork. Do not restore
Denis Vlasenko7b830e72009-03-31 13:05:32 +0000919 * tty pgrp then, only top-level shell process does that */
Denis Vlasenko60b392f2009-04-03 19:14:32 +0000920 if (G_interactive_fd && getpid() == G.root_pid)
921 tcsetpgrp(G_interactive_fd, G.saved_tty_pgrp);
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000922
923 /* Not a signal, just exit */
924 if (sig <= 0)
925 _exit(- sig);
926
Denis Vlasenko400d8bb2008-02-24 13:36:01 +0000927 kill_myself_with_sig(sig); /* does not return */
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +0000928}
Denis Vlasenkoe0755e52009-04-03 21:16:45 +0000929#endif
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000930
Mike Frysinger9f8128f2009-03-29 23:49:37 +0000931/* Restores tty foreground process group, and exits. */
932static void hush_exit(int exitcode) NORETURN;
933static void hush_exit(int exitcode)
934{
Denis Vlasenkod5762932009-03-31 11:22:57 +0000935 if (G.traps && G.traps[0] && G.traps[0][0]) {
936 char *argv[] = { NULL, xstrdup(G.traps[0]), NULL };
Denis Vlasenkof9375282009-04-05 19:13:39 +0000937//TODO: do we need to prevent recursion?
Denis Vlasenkod5762932009-03-31 11:22:57 +0000938 builtin_eval(argv);
939 free(argv[1]);
940 }
Mike Frysinger9f8128f2009-03-29 23:49:37 +0000941
Denis Vlasenkoabedaac2009-03-31 12:03:40 +0000942#if ENABLE_HUSH_JOB
943 fflush(NULL); /* flush all streams */
944 sigexit(- (exitcode & 0xff));
945#else
946 exit(exitcode);
947#endif
Mike Frysinger9f8128f2009-03-29 23:49:37 +0000948}
949
Denis Vlasenkob81b3df2007-04-28 16:48:04 +0000950
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000951static const char *set_cwd(void)
952{
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000953 /* xrealloc_getcwd_or_warn(arg) calls free(arg),
954 * we must not try to free(bb_msg_unknown) */
Denis Vlasenko87a86552008-07-29 19:43:10 +0000955 if (G.cwd == bb_msg_unknown)
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000956 G.cwd = NULL;
Denis Vlasenko87a86552008-07-29 19:43:10 +0000957 G.cwd = xrealloc_getcwd_or_warn((char *)G.cwd);
958 if (!G.cwd)
959 G.cwd = bb_msg_unknown;
960 return G.cwd;
Eric Andersen9ffb7dd2001-05-19 03:00:46 +0000961}
962
Denis Vlasenko83506862007-11-23 13:11:42 +0000963
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000964/* Get/check local shell variables */
965static struct variable *get_local_var(const char *name)
966{
967 struct variable *cur;
968 int len;
969
970 if (!name)
971 return NULL;
972 len = strlen(name);
973 for (cur = G.top_var; cur; cur = cur->next) {
974 if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
975 return cur;
976 }
977 return NULL;
978}
979
Denis Vlasenko6da69cd2009-04-04 12:12:58 +0000980static const char *get_local_var_value(const char *src)
Denis Vlasenko424f79b2009-03-22 14:23:34 +0000981{
982 struct variable *var = get_local_var(src);
983 if (var)
984 return strchr(var->varstr, '=') + 1;
985 return NULL;
986}
987
988/* str holds "NAME=VAL" and is expected to be malloced.
Mike Frysinger6379bb42009-03-28 18:55:03 +0000989 * We take ownership of it.
Denis Vlasenko0bb4a232009-04-05 01:42:59 +0000990 * flg_export:
Mike Frysinger6379bb42009-03-28 18:55:03 +0000991 * 0: do not export
992 * 1: export
993 * -1: if NAME is set, leave export status alone
994 * if NAME is not set, do not export
Denis Vlasenko0bb4a232009-04-05 01:42:59 +0000995 * flg_read_only is set only when we handle -R var=val
Mike Frysinger6379bb42009-03-28 18:55:03 +0000996 */
Denis Vlasenko0bb4a232009-04-05 01:42:59 +0000997#if BB_MMU
998#define set_local_var(str, flg_export, flg_read_only) \
999 set_local_var(str, flg_export)
1000#endif
1001static int set_local_var(char *str, int flg_export, int flg_read_only)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001002{
1003 struct variable *cur;
1004 char *value;
1005 int name_len;
1006
1007 value = strchr(str, '=');
1008 if (!value) { /* not expected to ever happen? */
1009 free(str);
1010 return -1;
1011 }
1012
1013 name_len = value - str + 1; /* including '=' */
1014 cur = G.top_var; /* cannot be NULL (we have HUSH_VERSION and it's RO) */
1015 while (1) {
1016 if (strncmp(cur->varstr, str, name_len) != 0) {
1017 if (!cur->next) {
1018 /* Bail out. Note that now cur points
1019 * to last var in linked list */
1020 break;
1021 }
1022 cur = cur->next;
1023 continue;
1024 }
1025 /* We found an existing var with this name */
1026 *value = '\0';
1027 if (cur->flg_read_only) {
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00001028#if !BB_MMU
1029 if (!flg_read_only)
1030#endif
1031 bb_error_msg("%s: readonly variable", str);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001032 free(str);
1033 return -1;
1034 }
1035 debug_printf_env("%s: unsetenv '%s'\n", __func__, str);
1036 unsetenv(str); /* just in case */
1037 *value = '=';
1038 if (strcmp(cur->varstr, str) == 0) {
1039 free_and_exp:
1040 free(str);
1041 goto exp;
1042 }
1043 if (cur->max_len >= strlen(str)) {
1044 /* This one is from startup env, reuse space */
1045 strcpy(cur->varstr, str);
1046 goto free_and_exp;
1047 }
1048 /* max_len == 0 signifies "malloced" var, which we can
1049 * (and has to) free */
1050 if (!cur->max_len)
1051 free(cur->varstr);
1052 cur->max_len = 0;
1053 goto set_str_and_exp;
1054 }
1055
1056 /* Not found - create next variable struct */
1057 cur->next = xzalloc(sizeof(*cur));
1058 cur = cur->next;
1059
1060 set_str_and_exp:
1061 cur->varstr = str;
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00001062#if !BB_MMU
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00001063 cur->flg_read_only = flg_read_only;
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00001064#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001065 exp:
Mike Frysinger6379bb42009-03-28 18:55:03 +00001066 if (flg_export == 1)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001067 cur->flg_export = 1;
1068 if (cur->flg_export) {
1069 debug_printf_env("%s: putenv '%s'\n", __func__, cur->varstr);
1070 return putenv(cur->varstr);
1071 }
1072 return 0;
1073}
1074
Mike Frysingerd690f682009-03-30 06:50:54 +00001075static int unset_local_var(const char *name)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001076{
1077 struct variable *cur;
1078 struct variable *prev = prev; /* for gcc */
1079 int name_len;
1080
1081 if (!name)
Mike Frysingerd690f682009-03-30 06:50:54 +00001082 return EXIT_SUCCESS;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001083 name_len = strlen(name);
1084 cur = G.top_var;
1085 while (cur) {
1086 if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') {
1087 if (cur->flg_read_only) {
1088 bb_error_msg("%s: readonly variable", name);
Mike Frysingerd690f682009-03-30 06:50:54 +00001089 return EXIT_FAILURE;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001090 }
1091 /* prev is ok to use here because 1st variable, HUSH_VERSION,
1092 * is ro, and we cannot reach this code on the 1st pass */
1093 prev->next = cur->next;
1094 debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr);
1095 bb_unsetenv(cur->varstr);
1096 if (!cur->max_len)
1097 free(cur->varstr);
1098 free(cur);
Mike Frysingerd690f682009-03-30 06:50:54 +00001099 return EXIT_SUCCESS;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001100 }
1101 prev = cur;
1102 cur = cur->next;
1103 }
Mike Frysingerd690f682009-03-30 06:50:54 +00001104 return EXIT_SUCCESS;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001105}
1106
Mike Frysinger98c52642009-04-02 10:02:37 +00001107#if ENABLE_SH_MATH_SUPPORT
1108#define is_name(c) ((c) == '_' || isalpha((unsigned char)(c)))
1109#define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c)))
1110static char *endofname(const char *name)
1111{
1112 char *p;
1113
1114 p = (char *) name;
1115 if (!is_name(*p))
1116 return p;
1117 while (*++p) {
1118 if (!is_in_name(*p))
1119 break;
1120 }
1121 return p;
1122}
1123
1124static void arith_set_local_var(const char *name, const char *val, int flags)
1125{
1126 /* arith code doesnt malloc space, so do it for it */
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00001127 char *var = xasprintf("%s=%s", name, val);
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00001128 set_local_var(var, flags, 0);
Mike Frysinger98c52642009-04-02 10:02:37 +00001129}
1130#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001131
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00001132
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001133/*
1134 * in_str support
1135 */
1136static int static_get(struct in_str *i)
1137{
1138 int ch = *i->p++;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00001139 if (ch != '\0')
1140 return ch;
1141 i->p--;
1142 return EOF;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001143}
1144
1145static int static_peek(struct in_str *i)
1146{
1147 return *i->p;
1148}
1149
1150#if ENABLE_HUSH_INTERACTIVE
1151
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001152static void cmdedit_set_initial_prompt(void)
1153{
Mike Frysingerec2c6552009-03-28 12:24:44 +00001154 if (ENABLE_FEATURE_EDITING_FANCY_PROMPT) {
1155 G.PS1 = getenv("PS1");
1156 if (G.PS1 == NULL)
1157 G.PS1 = "\\w \\$ ";
1158 } else
1159 G.PS1 = NULL;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001160}
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001161
1162static const char* setup_prompt_string(int promptmode)
1163{
1164 const char *prompt_str;
1165 debug_printf("setup_prompt_string %d ", promptmode);
Mike Frysingerec2c6552009-03-28 12:24:44 +00001166 if (!ENABLE_FEATURE_EDITING_FANCY_PROMPT) {
1167 /* Set up the prompt */
1168 if (promptmode == 0) { /* PS1 */
1169 free((char*)G.PS1);
1170 G.PS1 = xasprintf("%s %c ", G.cwd, (geteuid() != 0) ? '$' : '#');
1171 prompt_str = G.PS1;
1172 } else
1173 prompt_str = G.PS2;
1174 } else
1175 prompt_str = (promptmode == 0) ? G.PS1 : G.PS2;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001176 debug_printf("result '%s'\n", prompt_str);
1177 return prompt_str;
1178}
1179
1180static void get_user_input(struct in_str *i)
1181{
1182 int r;
1183 const char *prompt_str;
1184
1185 prompt_str = setup_prompt_string(i->promptmode);
1186#if ENABLE_FEATURE_EDITING
1187 /* Enable command line editing only while a command line
1188 * is actually being read */
1189 do {
Denis Vlasenko422cd7c2009-03-31 12:41:52 +00001190 G.flag_SIGINT = 0;
1191 /* buglet: SIGINT will not make new prompt to appear _at once_,
1192 * only after <Enter>. (^C will work) */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001193 r = read_line_input(prompt_str, G.user_input_buf, BUFSIZ-1, G.line_input_state);
Denis Vlasenko422cd7c2009-03-31 12:41:52 +00001194 /* catch *SIGINT* etc (^C is handled by read_line_input) */
Denis Vlasenko7566bae2009-03-31 17:24:49 +00001195 check_and_run_traps(0);
Denis Vlasenko422cd7c2009-03-31 12:41:52 +00001196 } while (r == 0 || G.flag_SIGINT); /* repeat if ^C or SIGINT */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001197 i->eof_flag = (r < 0);
1198 if (i->eof_flag) { /* EOF/error detected */
1199 G.user_input_buf[0] = EOF; /* yes, it will be truncated, it's ok */
1200 G.user_input_buf[1] = '\0';
1201 }
1202#else
Denis Vlasenko422cd7c2009-03-31 12:41:52 +00001203 do {
1204 G.flag_SIGINT = 0;
1205 fputs(prompt_str, stdout);
1206 fflush(stdout);
1207 G.user_input_buf[0] = r = fgetc(i->file);
1208 /*G.user_input_buf[1] = '\0'; - already is and never changed */
Denis Vlasenko7566bae2009-03-31 17:24:49 +00001209//do we need check_and_run_traps(0)? (maybe only if stdin)
Denis Vlasenko422cd7c2009-03-31 12:41:52 +00001210 } while (G.flag_SIGINT);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001211 i->eof_flag = (r == EOF);
1212#endif
1213 i->p = G.user_input_buf;
1214}
1215
1216#endif /* INTERACTIVE */
1217
1218/* This is the magic location that prints prompts
1219 * and gets data back from the user */
1220static int file_get(struct in_str *i)
1221{
1222 int ch;
1223
1224 /* If there is data waiting, eat it up */
1225 if (i->p && *i->p) {
1226#if ENABLE_HUSH_INTERACTIVE
1227 take_cached:
1228#endif
1229 ch = *i->p++;
1230 if (i->eof_flag && !*i->p)
1231 ch = EOF;
Denis Vlasenko913a2012009-04-05 22:17:04 +00001232 /* note: ch is never NUL */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001233 } else {
1234 /* need to double check i->file because we might be doing something
1235 * more complicated by now, like sourcing or substituting. */
1236#if ENABLE_HUSH_INTERACTIVE
Denis Vlasenko60b392f2009-04-03 19:14:32 +00001237 if (G_interactive_fd && i->promptme && i->file == stdin) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001238 do {
1239 get_user_input(i);
1240 } while (!*i->p); /* need non-empty line */
1241 i->promptmode = 1; /* PS2 */
1242 i->promptme = 0;
1243 goto take_cached;
1244 }
1245#endif
Denis Vlasenko913a2012009-04-05 22:17:04 +00001246 do ch = fgetc(i->file); while (ch == '\0');
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001247 }
Denis Vlasenko913a2012009-04-05 22:17:04 +00001248 debug_printf("file_get: got '%c' %d\n", ch, ch);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001249#if ENABLE_HUSH_INTERACTIVE
1250 if (ch == '\n')
1251 i->promptme = 1;
1252#endif
1253 return ch;
1254}
1255
Denis Vlasenko913a2012009-04-05 22:17:04 +00001256/* All callers guarantee this routine will never
1257 * be used right after a newline, so prompting is not needed.
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001258 */
1259static int file_peek(struct in_str *i)
1260{
1261 int ch;
1262 if (i->p && *i->p) {
1263 if (i->eof_flag && !i->p[1])
1264 return EOF;
1265 return *i->p;
Denis Vlasenko913a2012009-04-05 22:17:04 +00001266 /* note: ch is never NUL */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001267 }
Denis Vlasenko913a2012009-04-05 22:17:04 +00001268 do ch = fgetc(i->file); while (ch == '\0');
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001269 i->eof_flag = (ch == EOF);
1270 i->peek_buf[0] = ch;
1271 i->peek_buf[1] = '\0';
1272 i->p = i->peek_buf;
Denis Vlasenko913a2012009-04-05 22:17:04 +00001273 debug_printf("file_peek: got '%c' %d\n", ch, ch);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001274 return ch;
1275}
1276
1277static void setup_file_in_str(struct in_str *i, FILE *f)
1278{
1279 i->peek = file_peek;
1280 i->get = file_get;
1281#if ENABLE_HUSH_INTERACTIVE
1282 i->promptme = 1;
1283 i->promptmode = 0; /* PS1 */
1284#endif
1285 i->file = f;
1286 i->p = NULL;
1287}
1288
1289static void setup_string_in_str(struct in_str *i, const char *s)
1290{
1291 i->peek = static_peek;
1292 i->get = static_get;
1293#if ENABLE_HUSH_INTERACTIVE
1294 i->promptme = 1;
1295 i->promptmode = 0; /* PS1 */
1296#endif
1297 i->p = s;
1298 i->eof_flag = 0;
1299}
1300
1301
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001302/*
1303 * o_string support
1304 */
1305#define B_CHUNK (32 * sizeof(char*))
Eric Andersen25f27032001-04-26 23:22:31 +00001306
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00001307static void o_reset(o_string *o)
Eric Andersen25f27032001-04-26 23:22:31 +00001308{
1309 o->length = 0;
1310 o->nonnull = 0;
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001311 if (o->data)
1312 o->data[0] = '\0';
Eric Andersen25f27032001-04-26 23:22:31 +00001313}
1314
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00001315static void o_free(o_string *o)
Eric Andersen25f27032001-04-26 23:22:31 +00001316{
Aaron Lehmanna170e1c2002-11-28 11:27:31 +00001317 free(o->data);
Denis Vlasenkod65ea392007-10-01 10:02:25 +00001318 memset(o, 0, sizeof(*o));
Eric Andersen25f27032001-04-26 23:22:31 +00001319}
1320
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001321static ALWAYS_INLINE void o_free_unsafe(o_string *o)
1322{
1323 free(o->data);
1324}
1325
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00001326static void o_grow_by(o_string *o, int len)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001327{
1328 if (o->length + len > o->maxlen) {
1329 o->maxlen += (2*len > B_CHUNK ? 2*len : B_CHUNK);
1330 o->data = xrealloc(o->data, 1 + o->maxlen);
1331 }
1332}
1333
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00001334static void o_addchr(o_string *o, int ch)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001335{
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00001336 debug_printf("o_addchr: '%c' o->length=%d o=%p\n", ch, o->length, o);
1337 o_grow_by(o, 1);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001338 o->data[o->length] = ch;
1339 o->length++;
1340 o->data[o->length] = '\0';
1341}
1342
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001343static void o_addblock(o_string *o, const char *str, int len)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001344{
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00001345 o_grow_by(o, len);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001346 memcpy(&o->data[o->length], str, len);
1347 o->length += len;
1348 o->data[o->length] = '\0';
1349}
1350
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001351#if !BB_MMU
1352static void o_addstr(o_string *o, const char *str)
Mike Frysinger98c52642009-04-02 10:02:37 +00001353{
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001354 o_addblock(o, str, strlen(str));
1355}
1356#endif
1357
1358static void o_addstr_with_NUL(o_string *o, const char *str)
1359{
1360 o_addblock(o, str, strlen(str) + 1);
Mike Frysinger98c52642009-04-02 10:02:37 +00001361}
1362
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001363static void o_addblock_duplicate_backslash(o_string *o, const char *str, int len)
Denis Vlasenko55789c62008-06-18 16:30:42 +00001364{
1365 while (len) {
1366 o_addchr(o, *str);
1367 if (*str++ == '\\'
1368 && (*str != '*' && *str != '?' && *str != '[')
1369 ) {
1370 o_addchr(o, '\\');
1371 }
1372 len--;
1373 }
1374}
1375
Eric Andersen25f27032001-04-26 23:22:31 +00001376/* My analysis of quoting semantics tells me that state information
1377 * is associated with a destination, not a source.
1378 */
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00001379static void o_addqchr(o_string *o, int ch)
Eric Andersen25f27032001-04-26 23:22:31 +00001380{
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00001381 int sz = 1;
Denis Vlasenko371de4a2008-10-14 12:43:13 +00001382 char *found = strchr("*?[\\", ch);
1383 if (found)
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00001384 sz++;
Denis Vlasenko371de4a2008-10-14 12:43:13 +00001385 o_grow_by(o, sz);
1386 if (found) {
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00001387 o->data[o->length] = '\\';
1388 o->length++;
Eric Andersen25f27032001-04-26 23:22:31 +00001389 }
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00001390 o->data[o->length] = ch;
1391 o->length++;
1392 o->data[o->length] = '\0';
Eric Andersen25f27032001-04-26 23:22:31 +00001393}
1394
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00001395static void o_addQchr(o_string *o, int ch)
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00001396{
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00001397 int sz = 1;
Denis Vlasenkob7aaae92009-04-02 20:17:49 +00001398 if (o->o_escape && strchr("*?[\\", ch)) {
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00001399 sz++;
1400 o->data[o->length] = '\\';
1401 o->length++;
1402 }
1403 o_grow_by(o, sz);
1404 o->data[o->length] = ch;
1405 o->length++;
1406 o->data[o->length] = '\0';
1407}
1408
1409static void o_addQstr(o_string *o, const char *str, int len)
1410{
Denis Vlasenkob7aaae92009-04-02 20:17:49 +00001411 if (!o->o_escape) {
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001412 o_addblock(o, str, len);
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00001413 return;
1414 }
1415 while (len) {
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00001416 char ch;
1417 int sz;
1418 int ordinary_cnt = strcspn(str, "*?[\\");
1419 if (ordinary_cnt > len) /* paranoia */
1420 ordinary_cnt = len;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001421 o_addblock(o, str, ordinary_cnt);
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00001422 if (ordinary_cnt == len)
1423 return;
1424 str += ordinary_cnt;
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00001425 len -= ordinary_cnt + 1; /* we are processing + 1 char below */
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00001426
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00001427 ch = *str++;
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00001428 sz = 1;
1429 if (ch) { /* it is necessarily one of "*?[\\" */
1430 sz++;
1431 o->data[o->length] = '\\';
1432 o->length++;
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00001433 }
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00001434 o_grow_by(o, sz);
1435 o->data[o->length] = ch;
1436 o->length++;
1437 o->data[o->length] = '\0';
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00001438 }
1439}
1440
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001441/* A special kind of o_string for $VAR and `cmd` expansion.
1442 * It contains char* list[] at the beginning, which is grown in 16 element
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00001443 * increments. Actual string data starts at the next multiple of 16 * (char*).
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001444 * list[i] contains an INDEX (int!) into this string data.
1445 * It means that if list[] needs to grow, data needs to be moved higher up
1446 * but list[i]'s need not be modified.
1447 * NB: remembering how many list[i]'s you have there is crucial.
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00001448 * o_finalize_list() operation post-processes this structure - calculates
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001449 * and stores actual char* ptrs in list[]. Oh, it NULL terminates it as well.
1450 */
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00001451#if DEBUG_EXPAND || DEBUG_GLOB
1452static void debug_print_list(const char *prefix, o_string *o, int n)
1453{
1454 char **list = (char**)o->data;
1455 int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
1456 int i = 0;
1457 fprintf(stderr, "%s: list:%p n:%d string_start:%d length:%d maxlen:%d\n",
1458 prefix, list, n, string_start, o->length, o->maxlen);
1459 while (i < n) {
1460 fprintf(stderr, " list[%d]=%d '%s' %p\n", i, (int)list[i],
1461 o->data + (int)list[i] + string_start,
1462 o->data + (int)list[i] + string_start);
1463 i++;
1464 }
1465 if (n) {
1466 const char *p = o->data + (int)list[n - 1] + string_start;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001467 fprintf(stderr, " total_sz:%ld\n", (long)((p + strlen(p) + 1) - o->data));
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00001468 }
1469}
1470#else
1471#define debug_print_list(prefix, o, n) ((void)0)
1472#endif
1473
1474/* n = o_save_ptr_helper(str, n) "starts new string" by storing an index value
1475 * in list[n] so that it points past last stored byte so far.
1476 * It returns n+1. */
1477static int o_save_ptr_helper(o_string *o, int n)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001478{
1479 char **list = (char**)o->data;
Denis Vlasenko895bea22008-06-10 18:06:24 +00001480 int string_start;
1481 int string_len;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001482
1483 if (!o->has_empty_slot) {
Denis Vlasenko895bea22008-06-10 18:06:24 +00001484 string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
1485 string_len = o->length - string_start;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001486 if (!(n & 0xf)) { /* 0, 0x10, 0x20...? */
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00001487 debug_printf_list("list[%d]=%d string_start=%d (growing)\n", n, string_len, string_start);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001488 /* list[n] points to string_start, make space for 16 more pointers */
1489 o->maxlen += 0x10 * sizeof(list[0]);
1490 o->data = xrealloc(o->data, o->maxlen + 1);
Denis Vlasenko7049ff82008-06-25 09:53:17 +00001491 list = (char**)o->data;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001492 memmove(list + n + 0x10, list + n, string_len);
1493 o->length += 0x10 * sizeof(list[0]);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00001494 } else {
1495 debug_printf_list("list[%d]=%d string_start=%d\n",
1496 n, string_len, string_start);
1497 }
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001498 } else {
1499 /* We have empty slot at list[n], reuse without growth */
Denis Vlasenko895bea22008-06-10 18:06:24 +00001500 string_start = ((n+1 + 0xf) & ~0xf) * sizeof(list[0]); /* NB: n+1! */
1501 string_len = o->length - string_start;
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00001502 debug_printf_list("list[%d]=%d string_start=%d (empty slot)\n",
1503 n, string_len, string_start);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001504 o->has_empty_slot = 0;
1505 }
Denis Vlasenkocc3f20b2008-06-23 22:31:52 +00001506 list[n] = (char*)(ptrdiff_t)string_len;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001507 return n + 1;
1508}
1509
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00001510/* "What was our last o_save_ptr'ed position (byte offset relative o->data)?" */
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00001511static int o_get_last_ptr(o_string *o, int n)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001512{
1513 char **list = (char**)o->data;
1514 int string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
1515
Denis Vlasenkocc3f20b2008-06-23 22:31:52 +00001516 return ((int)(ptrdiff_t)list[n-1]) + string_start;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001517}
1518
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00001519/* o_glob performs globbing on last list[], saving each result
Denis Vlasenko55789c62008-06-18 16:30:42 +00001520 * as a new list[]. */
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00001521static int o_glob(o_string *o, int n)
1522{
1523 glob_t globdata;
1524 int gr;
1525 char *pattern;
1526
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00001527 debug_printf_glob("start o_glob: n:%d o->data:%p\n", n, o->data);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00001528 if (!o->data)
1529 return o_save_ptr_helper(o, n);
1530 pattern = o->data + o_get_last_ptr(o, n);
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00001531 debug_printf_glob("glob pattern '%s'\n", pattern);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00001532 if (!glob_needed(pattern)) {
1533 literal:
1534 o->length = unbackslash(pattern) - o->data;
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00001535 debug_printf_glob("glob pattern '%s' is literal\n", pattern);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00001536 return o_save_ptr_helper(o, n);
1537 }
1538
1539 memset(&globdata, 0, sizeof(globdata));
1540 gr = glob(pattern, 0, NULL, &globdata);
1541 debug_printf_glob("glob('%s'):%d\n", pattern, gr);
1542 if (gr == GLOB_NOSPACE)
1543 bb_error_msg_and_die("out of memory during glob");
1544 if (gr == GLOB_NOMATCH) {
1545 globfree(&globdata);
1546 goto literal;
1547 }
1548 if (gr != 0) { /* GLOB_ABORTED ? */
1549//TODO: testcase for bad glob pattern behavior
1550 bb_error_msg("glob(3) error %d on '%s'", gr, pattern);
1551 }
1552 if (globdata.gl_pathv && globdata.gl_pathv[0]) {
1553 char **argv = globdata.gl_pathv;
1554 o->length = pattern - o->data; /* "forget" pattern */
1555 while (1) {
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001556 o_addstr_with_NUL(o, *argv);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00001557 n = o_save_ptr_helper(o, n);
1558 argv++;
1559 if (!*argv)
1560 break;
1561 }
1562 }
1563 globfree(&globdata);
1564 if (DEBUG_GLOB)
1565 debug_print_list("o_glob returning", o, n);
1566 return n;
1567}
1568
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00001569/* If o->o_glob == 1, glob the string so far remembered.
1570 * Otherwise, just finish current list[] and start new */
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00001571static int o_save_ptr(o_string *o, int n)
1572{
Denis Vlasenkoa8b6dff2009-03-20 12:05:14 +00001573 if (o->o_glob) { /* if globbing is requested */
1574 /* If o->has_empty_slot, list[n] was already globbed
1575 * (if it was requested back then when it was filled)
1576 * so don't do that again! */
1577 if (!o->has_empty_slot)
1578 return o_glob(o, n); /* o_save_ptr_helper is inside */
1579 }
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00001580 return o_save_ptr_helper(o, n);
1581}
1582
1583/* "Please convert list[n] to real char* ptrs, and NULL terminate it." */
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00001584static char **o_finalize_list(o_string *o, int n)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001585{
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00001586 char **list;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001587 int string_start;
1588
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00001589 n = o_save_ptr(o, n); /* force growth for list[n] if necessary */
1590 if (DEBUG_EXPAND)
1591 debug_print_list("finalized", o, n);
Denis Vlasenko30c9cc52008-06-17 07:24:29 +00001592 debug_printf_expand("finalized n:%d\n", n);
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00001593 list = (char**)o->data;
1594 string_start = ((n + 0xf) & ~0xf) * sizeof(list[0]);
1595 list[--n] = NULL;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001596 while (n) {
1597 n--;
Denis Vlasenkocc3f20b2008-06-23 22:31:52 +00001598 list[n] = o->data + (int)(ptrdiff_t)list[n] + string_start;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001599 }
1600 return list;
1601}
1602
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00001603
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001604/* Expansion can recurse */
1605#if ENABLE_HUSH_TICK
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00001606static int process_command_subs(o_string *dest, const char *s);
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001607#endif
1608static char *expand_string_to_string(const char *str);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001609#if BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00001610#define parse_stream_dquoted(as_string, dest, input, dquote_end) \
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001611 parse_stream_dquoted(dest, input, dquote_end)
1612#endif
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00001613static int parse_stream_dquoted(o_string *as_string,
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001614 o_string *dest,
1615 struct in_str *input,
1616 int dquote_end);
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001617
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001618/* expand_strvec_to_strvec() takes a list of strings, expands
1619 * all variable references within and returns a pointer to
1620 * a list of expanded strings, possibly with larger number
1621 * of strings. (Think VAR="a b"; echo $VAR).
1622 * This new list is allocated as a single malloc block.
1623 * NULL-terminated list of char* pointers is at the beginning of it,
1624 * followed by strings themself.
1625 * Caller can deallocate entire list by single free(list). */
Eric Andersen25f27032001-04-26 23:22:31 +00001626
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001627/* Store given string, finalizing the word and starting new one whenever
1628 * we encounter IFS char(s). This is used for expanding variable values.
1629 * End-of-string does NOT finalize word: think about 'echo -$VAR-' */
1630static int expand_on_ifs(o_string *output, int n, const char *str)
Eric Andersen25f27032001-04-26 23:22:31 +00001631{
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001632 while (1) {
1633 int word_len = strcspn(str, G.ifs);
1634 if (word_len) {
Denis Vlasenkob7aaae92009-04-02 20:17:49 +00001635 if (output->o_escape || !output->o_glob)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001636 o_addQstr(output, str, word_len);
1637 else /* protect backslashes against globbing up :) */
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001638 o_addblock_duplicate_backslash(output, str, word_len);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001639 str += word_len;
1640 }
1641 if (!*str) /* EOL - do not finalize word */
1642 break;
1643 o_addchr(output, '\0');
1644 debug_print_list("expand_on_ifs", output, n);
1645 n = o_save_ptr(output, n);
1646 str += strspn(str, G.ifs); /* skip ifs chars */
Eric Andersen25f27032001-04-26 23:22:31 +00001647 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001648 debug_print_list("expand_on_ifs[1]", output, n);
1649 return n;
Eric Andersen25f27032001-04-26 23:22:31 +00001650}
1651
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001652/* Expand all variable references in given string, adding words to list[]
1653 * at n, n+1,... positions. Return updated n (so that list[n] is next one
1654 * to be filled). This routine is extremely tricky: has to deal with
1655 * variables/parameters with whitespace, $* and $@, and constructs like
1656 * 'echo -$*-'. If you play here, you must run testsuite afterwards! */
1657static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
Eric Andersen25f27032001-04-26 23:22:31 +00001658{
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001659 /* or_mask is either 0 (normal case) or 0x80
1660 * (expansion of right-hand side of assignment == 1-element expand.
1661 * It will also do no globbing, and thus we must not backslash-quote!) */
Eric Andersen25f27032001-04-26 23:22:31 +00001662
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001663 char first_ch, ored_ch;
1664 int i;
1665 const char *val;
1666 char *p;
1667
1668 ored_ch = 0;
1669
1670 debug_printf_expand("expand_vars_to_list: arg '%s'\n", arg);
1671 debug_print_list("expand_vars_to_list", output, n);
1672 n = o_save_ptr(output, n);
1673 debug_print_list("expand_vars_to_list[0]", output, n);
1674
1675 while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) {
1676#if ENABLE_HUSH_TICK
1677 o_string subst_result = NULL_O_STRING;
Denis Vlasenko96f67dc2007-05-17 13:02:41 +00001678#endif
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001679#if ENABLE_SH_MATH_SUPPORT
1680 char arith_buf[sizeof(arith_t)*3 + 2];
1681#endif
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001682 o_addblock(output, arg, p - arg);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001683 debug_print_list("expand_vars_to_list[1]", output, n);
1684 arg = ++p;
1685 p = strchr(p, SPECIAL_VAR_SYMBOL);
1686
1687 first_ch = arg[0] | or_mask; /* forced to "quoted" if or_mask = 0x80 */
1688 /* "$@" is special. Even if quoted, it can still
1689 * expand to nothing (not even an empty string) */
1690 if ((first_ch & 0x7f) != '@')
1691 ored_ch |= first_ch;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001692
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001693 val = NULL;
1694 switch (first_ch & 0x7f) {
1695 /* Highest bit in first_ch indicates that var is double-quoted */
1696 case '$': /* pid */
1697 val = utoa(G.root_pid);
1698 break;
1699 case '!': /* bg pid */
1700 val = G.last_bg_pid ? utoa(G.last_bg_pid) : (char*)"";
1701 break;
1702 case '?': /* exitcode */
1703 val = utoa(G.last_return_code);
1704 break;
1705 case '#': /* argc */
Mike Frysinger6379bb42009-03-28 18:55:03 +00001706 if (arg[1] != SPECIAL_VAR_SYMBOL)
1707 /* actually, it's a ${#var} */
1708 goto case_default;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001709 val = utoa(G.global_argc ? G.global_argc-1 : 0);
1710 break;
1711 case '*':
1712 case '@':
1713 i = 1;
1714 if (!G.global_argv[i])
1715 break;
1716 ored_ch |= first_ch; /* do it for "$@" _now_, when we know it's not empty */
1717 if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
Denis Vlasenkob7aaae92009-04-02 20:17:49 +00001718 smallint sv = output->o_escape;
1719 /* unquoted var's contents should be globbed, so don't escape */
1720 output->o_escape = 0;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001721 while (G.global_argv[i]) {
1722 n = expand_on_ifs(output, n, G.global_argv[i]);
1723 debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1);
1724 if (G.global_argv[i++][0] && G.global_argv[i]) {
1725 /* this argv[] is not empty and not last:
1726 * put terminating NUL, start new word */
1727 o_addchr(output, '\0');
1728 debug_print_list("expand_vars_to_list[2]", output, n);
1729 n = o_save_ptr(output, n);
1730 debug_print_list("expand_vars_to_list[3]", output, n);
1731 }
1732 }
Denis Vlasenkob7aaae92009-04-02 20:17:49 +00001733 output->o_escape = sv;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001734 } else
1735 /* If or_mask is nonzero, we handle assignment 'a=....$@.....'
1736 * and in this case should treat it like '$*' - see 'else...' below */
1737 if (first_ch == ('@'|0x80) && !or_mask) { /* quoted $@ */
1738 while (1) {
1739 o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i]));
1740 if (++i >= G.global_argc)
1741 break;
1742 o_addchr(output, '\0');
1743 debug_print_list("expand_vars_to_list[4]", output, n);
1744 n = o_save_ptr(output, n);
1745 }
1746 } else { /* quoted $*: add as one word */
1747 while (1) {
1748 o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i]));
1749 if (!G.global_argv[++i])
1750 break;
1751 if (G.ifs[0])
1752 o_addchr(output, G.ifs[0]);
1753 }
1754 }
1755 break;
1756 case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */
1757 /* "Empty variable", used to make "" etc to not disappear */
1758 arg++;
1759 ored_ch = 0x80;
1760 break;
1761#if ENABLE_HUSH_TICK
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00001762 case '`': /* <SPECIAL_VAR_SYMBOL>`cmd<SPECIAL_VAR_SYMBOL> */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001763 *p = '\0';
1764 arg++;
1765//TODO: can we just stuff it into "output" directly?
1766 debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch);
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00001767 process_command_subs(&subst_result, arg);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001768 debug_printf_subst("SUBST RES '%s'\n", subst_result.data);
1769 val = subst_result.data;
1770 goto store_val;
Denis Vlasenko96f67dc2007-05-17 13:02:41 +00001771#endif
Mike Frysinger98c52642009-04-02 10:02:37 +00001772#if ENABLE_SH_MATH_SUPPORT
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001773 case '+': { /* <SPECIAL_VAR_SYMBOL>+cmd<SPECIAL_VAR_SYMBOL> */
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00001774 arith_eval_hooks_t hooks;
Mike Frysinger98c52642009-04-02 10:02:37 +00001775 arith_t res;
Mike Frysinger98c52642009-04-02 10:02:37 +00001776 int errcode;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001777 char *exp_str;
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00001778
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001779 arg++; /* skip '+' */
1780 *p = '\0'; /* replace trailing <SPECIAL_VAR_SYMBOL> */
Mike Frysinger98c52642009-04-02 10:02:37 +00001781 debug_printf_subst("ARITH '%s' first_ch %x\n", arg, first_ch);
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001782
1783 /* Optional: skip expansion if expr is simple ("a + 3", "i++" etc) */
Denis Vlasenkob1d11bf2009-04-06 12:24:58 +00001784 exp_str = NULL;
1785 if (strchr(arg, '$') != NULL
1786#if ENABLE_HUSH_TICK
1787 || strchr(arg, '`') != NULL
1788#endif
1789 ) {
1790 /* We need to expand. Example:
1791 * echo $(($a + `echo 1`)) $((1 + $((2)) ))
1792 */
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001793 struct in_str input;
1794 o_string dest = NULL_O_STRING;
1795
1796 setup_string_in_str(&input, arg);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001797 parse_stream_dquoted(NULL, &dest, &input, EOF);
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001798 //bb_error_msg("'%s' -> '%s'", arg, dest.data);
1799 exp_str = expand_string_to_string(dest.data);
1800 //bb_error_msg("'%s' -> '%s'", dest.data, exp_str);
Denis Vlasenko5e883fb2009-04-06 12:28:34 +00001801 o_free_unsafe(&dest);
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001802 }
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00001803 hooks.lookupvar = get_local_var_value;
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00001804 hooks.setvar = arith_set_local_var;
1805 hooks.endofname = endofname;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001806 res = arith(exp_str ? exp_str : arg, &errcode, &hooks);
1807 free(exp_str);
1808
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00001809 if (errcode < 0) {
Mike Frysinger98c52642009-04-02 10:02:37 +00001810 switch (errcode) {
1811 case -3: maybe_die("arith", "exponent less than 0"); break;
1812 case -2: maybe_die("arith", "divide by zero"); break;
1813 case -5: maybe_die("arith", "expression recursion loop detected"); break;
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00001814 default: maybe_die("arith", "syntax error"); break;
Mike Frysinger98c52642009-04-02 10:02:37 +00001815 }
Denis Vlasenkob29eb6e2009-04-02 13:46:27 +00001816 }
Mike Frysinger98c52642009-04-02 10:02:37 +00001817 debug_printf_subst("ARITH RES '"arith_t_fmt"'\n", res);
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001818 sprintf(arith_buf, arith_t_fmt, res);
1819 val = arith_buf;
Mike Frysinger98c52642009-04-02 10:02:37 +00001820 break;
1821 }
1822#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001823 default: /* <SPECIAL_VAR_SYMBOL>varname<SPECIAL_VAR_SYMBOL> */
Mike Frysinger6379bb42009-03-28 18:55:03 +00001824 case_default: {
Denis Vlasenko232be3e2009-04-05 09:16:00 +00001825 bool exp_len = false;
1826 bool exp_null = false;
1827 char *var = arg;
1828 char exp_save = exp_save; /* for compiler */
1829 char exp_op = exp_op; /* for compiler */
1830 char *exp_word = exp_word; /* for compiler */
Mike Frysinger6379bb42009-03-28 18:55:03 +00001831 size_t exp_off = 0;
Denis Vlasenko232be3e2009-04-05 09:16:00 +00001832
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001833 *p = '\0';
1834 arg[0] = first_ch & 0x7f;
Mike Frysinger6379bb42009-03-28 18:55:03 +00001835
1836 /* prepare for expansions */
1837 if (var[0] == '#') {
1838 /* handle length expansion ${#var} */
1839 exp_len = true;
1840 ++var;
1841 } else {
1842 /* maybe handle parameter expansion */
1843 exp_off = strcspn(var, ":-=+?");
1844 if (!var[exp_off])
1845 exp_off = 0;
1846 if (exp_off) {
1847 exp_save = var[exp_off];
1848 exp_null = exp_save == ':';
1849 exp_word = var + exp_off;
1850 if (exp_null) ++exp_word;
1851 exp_op = *exp_word++;
1852 var[exp_off] = '\0';
1853 }
1854 }
1855
1856 /* lookup the variable in question */
1857 if (isdigit(var[0])) {
Mike Frysinger7c3e52c2009-03-28 21:06:22 +00001858 /* handle_dollar() should have vetted var for us */
Mike Frysinger6379bb42009-03-28 18:55:03 +00001859 i = xatoi_u(var);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001860 if (i < G.global_argc)
1861 val = G.global_argv[i];
1862 /* else val remains NULL: $N with too big N */
1863 } else
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00001864 val = get_local_var_value(var);
Mike Frysinger6379bb42009-03-28 18:55:03 +00001865
1866 /* handle any expansions */
1867 if (exp_len) {
1868 debug_printf_expand("expand: length of '%s' = ", val);
1869 val = utoa(val ? strlen(val) : 0);
1870 debug_printf_expand("%s\n", val);
1871 } else if (exp_off) {
1872 /* we need to do an expansion */
1873 int exp_test = (!val || (exp_null && !val[0]));
1874 if (exp_op == '+')
1875 exp_test = !exp_test;
1876 debug_printf_expand("expand: op:%c (null:%s) test:%i\n", exp_op,
1877 exp_null ? "true" : "false", exp_test);
1878 if (exp_test) {
1879 if (exp_op == '?')
1880 maybe_die(var, *exp_word ? exp_word : "parameter null or not set");
1881 else
1882 val = exp_word;
1883
1884 if (exp_op == '=') {
1885 if (isdigit(var[0]) || var[0] == '#') {
1886 maybe_die(var, "special vars cannot assign in this way");
1887 val = NULL;
1888 } else {
1889 char *new_var = xmalloc(strlen(var) + strlen(val) + 2);
1890 sprintf(new_var, "%s=%s", var, val);
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00001891 set_local_var(new_var, -1, 0);
Mike Frysinger6379bb42009-03-28 18:55:03 +00001892 }
1893 }
1894 }
1895 var[exp_off] = exp_save;
1896 }
1897
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001898 arg[0] = first_ch;
1899#if ENABLE_HUSH_TICK
1900 store_val:
1901#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001902 if (!(first_ch & 0x80)) { /* unquoted $VAR */
Denis Vlasenkob7aaae92009-04-02 20:17:49 +00001903 debug_printf_expand("unquoted '%s', output->o_escape:%d\n", val, output->o_escape);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001904 if (val) {
Denis Vlasenkob7aaae92009-04-02 20:17:49 +00001905 /* unquoted var's contents should be globbed, so don't escape */
1906 smallint sv = output->o_escape;
1907 output->o_escape = 0;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001908 n = expand_on_ifs(output, n, val);
1909 val = NULL;
Denis Vlasenkob7aaae92009-04-02 20:17:49 +00001910 output->o_escape = sv;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001911 }
1912 } else { /* quoted $VAR, val will be appended below */
Denis Vlasenkob7aaae92009-04-02 20:17:49 +00001913 debug_printf_expand("quoted '%s', output->o_escape:%d\n", val, output->o_escape);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001914 }
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001915 } /* default: */
1916 } /* switch (char after <SPECIAL_VAR_SYMBOL>) */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001917 if (val) {
1918 o_addQstr(output, val, strlen(val));
1919 }
Mike Frysinger6379bb42009-03-28 18:55:03 +00001920 /* Do the check to avoid writing to a const string */
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00001921 if (*p != SPECIAL_VAR_SYMBOL)
Mike Frysinger6379bb42009-03-28 18:55:03 +00001922 *p = SPECIAL_VAR_SYMBOL;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001923
1924#if ENABLE_HUSH_TICK
1925 o_free(&subst_result);
1926#endif
1927 arg = ++p;
1928 } /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */
1929
1930 if (arg[0]) {
1931 debug_print_list("expand_vars_to_list[a]", output, n);
1932 /* this part is literal, and it was already pre-quoted
1933 * if needed (much earlier), do not use o_addQstr here! */
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00001934 o_addstr_with_NUL(output, arg);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001935 debug_print_list("expand_vars_to_list[b]", output, n);
1936 } else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */
1937 && !(ored_ch & 0x80) /* and all vars were not quoted. */
1938 ) {
1939 n--;
1940 /* allow to reuse list[n] later without re-growth */
1941 output->has_empty_slot = 1;
1942 } else {
1943 o_addchr(output, '\0');
Eric Andersen25f27032001-04-26 23:22:31 +00001944 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001945 return n;
Eric Andersen25f27032001-04-26 23:22:31 +00001946}
1947
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001948static char **expand_variables(char **argv, int or_mask)
Eric Andersen25f27032001-04-26 23:22:31 +00001949{
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001950 int n;
1951 char **list;
1952 char **v;
1953 o_string output = NULL_O_STRING;
1954
1955 if (or_mask & 0x100) {
Denis Vlasenkob7aaae92009-04-02 20:17:49 +00001956 output.o_escape = 1; /* protect against globbing for "$var" */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001957 /* (unquoted $var will temporarily switch it off) */
1958 output.o_glob = 1;
Eric Andersen25f27032001-04-26 23:22:31 +00001959 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001960
1961 n = 0;
1962 v = argv;
1963 while (*v) {
1964 n = expand_vars_to_list(&output, n, *v, (char)or_mask);
1965 v++;
1966 }
1967 debug_print_list("expand_variables", &output, n);
1968
1969 /* output.data (malloced in one block) gets returned in "list" */
1970 list = o_finalize_list(&output, n);
1971 debug_print_strings("expand_variables[1]", list);
1972 return list;
Eric Andersen25f27032001-04-26 23:22:31 +00001973}
1974
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001975static char **expand_strvec_to_strvec(char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +00001976{
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001977 return expand_variables(argv, 0x100);
Eric Andersen25f27032001-04-26 23:22:31 +00001978}
1979
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001980/* Used for expansion of right hand of assignments */
1981/* NB: should NOT do globbing! "export v=/bin/c*; env | grep ^v=" outputs
1982 * "v=/bin/c*" */
1983static char *expand_string_to_string(const char *str)
Eric Andersen25f27032001-04-26 23:22:31 +00001984{
Denis Vlasenko424f79b2009-03-22 14:23:34 +00001985 char *argv[2], **list;
1986
1987 argv[0] = (char*)str;
1988 argv[1] = NULL;
1989 list = expand_variables(argv, 0x80); /* 0x80: make one-element expansion */
1990 if (HUSH_DEBUG)
1991 if (!list[0] || list[1])
1992 bb_error_msg_and_die("BUG in varexp2");
1993 /* actually, just move string 2*sizeof(char*) bytes back */
1994 overlapping_strcpy((char*)list, list[0]);
1995 debug_printf_expand("string_to_string='%s'\n", (char*)list);
1996 return (char*)list;
1997}
1998
1999/* Used for "eval" builtin */
2000static char* expand_strvec_to_string(char **argv)
2001{
2002 char **list;
2003
2004 list = expand_variables(argv, 0x80);
2005 /* Convert all NULs to spaces */
2006 if (list[0]) {
2007 int n = 1;
2008 while (list[n]) {
2009 if (HUSH_DEBUG)
2010 if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
2011 bb_error_msg_and_die("BUG in varexp3");
2012 list[n][-1] = ' '; /* TODO: or to G.ifs[0]? */
2013 n++;
2014 }
2015 }
2016 overlapping_strcpy((char*)list, list[0]);
2017 debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
2018 return (char*)list;
2019}
2020
2021static char **expand_assignments(char **argv, int count)
2022{
2023 int i;
2024 char **p = NULL;
2025 /* Expand assignments into one string each */
2026 for (i = 0; i < count; i++) {
2027 p = add_string_to_strings(p, expand_string_to_string(argv[i]));
2028 }
2029 return p;
Eric Andersen25f27032001-04-26 23:22:31 +00002030}
2031
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00002032
Eric Andersen25f27032001-04-26 23:22:31 +00002033/* squirrel != NULL means we squirrel away copies of stdin, stdout,
2034 * and stderr if they are redirected. */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002035static int setup_redirects(struct command *prog, int squirrel[])
Eric Andersen25f27032001-04-26 23:22:31 +00002036{
2037 int openfd, mode;
2038 struct redir_struct *redir;
2039
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002040 for (redir = prog->redirects; redir; redir = redir->next) {
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00002041 if (redir->dup == -1 && redir->rd_filename == NULL) {
Eric Andersen817e73c2001-06-06 17:56:09 +00002042 /* something went wrong in the parse. Pretend it didn't happen */
2043 continue;
2044 }
Eric Andersen25f27032001-04-26 23:22:31 +00002045 if (redir->dup == -1) {
Denis Vlasenkocccdc4e2007-11-23 21:08:38 +00002046 char *p;
Denis Vlasenko55789c62008-06-18 16:30:42 +00002047 mode = redir_table[redir->rd_type].mode;
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00002048//TODO: check redir for names like '\\'
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00002049 p = expand_string_to_string(redir->rd_filename);
Denis Vlasenkocccdc4e2007-11-23 21:08:38 +00002050 openfd = open_or_warn(p, mode);
2051 free(p);
Eric Andersen25f27032001-04-26 23:22:31 +00002052 if (openfd < 0) {
2053 /* this could get lost if stderr has been redirected, but
2054 bash and ash both lose it as well (though zsh doesn't!) */
Eric Andersen25f27032001-04-26 23:22:31 +00002055 return 1;
2056 }
2057 } else {
2058 openfd = redir->dup;
2059 }
2060
2061 if (openfd != redir->fd) {
2062 if (squirrel && redir->fd < 3) {
2063 squirrel[redir->fd] = dup(redir->fd);
2064 }
Eric Andersen83a2ae22001-05-07 17:59:25 +00002065 if (openfd == -3) {
Mike Frysingerdc417802009-04-06 12:35:41 +00002066 /* "-" means "close me" and we use -3 for that */
2067 close(redir->fd);
Eric Andersen83a2ae22001-05-07 17:59:25 +00002068 } else {
2069 dup2(openfd, redir->fd);
Matt Kraaic616e532001-06-05 16:50:08 +00002070 if (redir->dup == -1)
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00002071 close(openfd);
Eric Andersen83a2ae22001-05-07 17:59:25 +00002072 }
Eric Andersen25f27032001-04-26 23:22:31 +00002073 }
2074 }
2075 return 0;
2076}
2077
2078static void restore_redirects(int squirrel[])
2079{
2080 int i, fd;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00002081 for (i = 0; i < 3; i++) {
Eric Andersen25f27032001-04-26 23:22:31 +00002082 fd = squirrel[i];
2083 if (fd != -1) {
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00002084 /* We simply die on error */
2085 xmove_fd(fd, i);
Eric Andersen25f27032001-04-26 23:22:31 +00002086 }
2087 }
2088}
2089
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002090
Denis Vlasenkoa0e65122009-04-05 23:39:14 +00002091#if !DEBUG_CLEAN
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002092#define free_pipe_list(head, indent) free_pipe_list(head)
2093#define free_pipe(pi, indent) free_pipe(pi)
2094#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00002095static void free_pipe_list(struct pipe *head, int indent);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002096
Denis Vlasenko34d4d892009-04-04 20:24:37 +00002097/* Return code is the exit status of the pipe */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00002098static void free_pipe(struct pipe *pi, int indent)
Denis Vlasenkof886fd22008-10-13 12:36:05 +00002099{
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002100 char **p;
2101 struct command *command;
2102 struct redir_struct *r, *rnext;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00002103 int a, i;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002104
Denis Vlasenko34d4d892009-04-04 20:24:37 +00002105 if (pi->stopped_cmds > 0) /* why? */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00002106 return;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002107 debug_printf_clean("%s run pipe: (pid %d)\n", indenter(indent), getpid());
2108 for (i = 0; i < pi->num_cmds; i++) {
2109 command = &pi->cmds[i];
2110 debug_printf_clean("%s command %d:\n", indenter(indent), i);
2111 if (command->argv) {
2112 for (a = 0, p = command->argv; *p; a++, p++) {
2113 debug_printf_clean("%s argv[%d] = %s\n", indenter(indent), a, *p);
2114 }
2115 free_strings(command->argv);
2116 command->argv = NULL;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00002117 }
2118 /* not "else if": on syntax error, we may have both! */
2119 if (command->group) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002120 debug_printf_clean("%s begin group (grp_type:%d)\n", indenter(indent), command->grp_type);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00002121 free_pipe_list(command->group, indent+3);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002122 debug_printf_clean("%s end group\n", indenter(indent));
Denis Vlasenkob6e65562009-04-03 16:49:04 +00002123 command->group = NULL;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002124 }
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002125#if !BB_MMU
2126 free(command->group_as_string);
2127 command->group_as_string = NULL;
2128#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002129 for (r = command->redirects; r; r = rnext) {
2130 debug_printf_clean("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->rd_type].descrip);
2131 if (r->dup == -1) {
2132 /* guard against the case >$FOO, where foo is unset or blank */
2133 if (r->rd_filename) {
2134 debug_printf_clean(" %s\n", r->rd_filename);
2135 free(r->rd_filename);
2136 r->rd_filename = NULL;
2137 }
2138 } else {
2139 debug_printf_clean("&%d\n", r->dup);
2140 }
2141 rnext = r->next;
2142 free(r);
2143 }
2144 command->redirects = NULL;
Denis Vlasenkof886fd22008-10-13 12:36:05 +00002145 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002146 free(pi->cmds); /* children are an array, they get freed all at once */
2147 pi->cmds = NULL;
2148#if ENABLE_HUSH_JOB
2149 free(pi->cmdtext);
2150 pi->cmdtext = NULL;
2151#endif
Denis Vlasenkof886fd22008-10-13 12:36:05 +00002152}
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00002153
Denis Vlasenkob6e65562009-04-03 16:49:04 +00002154static void free_pipe_list(struct pipe *head, int indent)
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002155{
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002156 struct pipe *pi, *next;
2157
2158 for (pi = head; pi; pi = next) {
2159#if HAS_KEYWORDS
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00002160 debug_printf_clean("%s pipe reserved word %d\n", indenter(indent), pi->res_word);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002161#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00002162 free_pipe(pi, indent);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002163 debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup);
2164 next = pi->next;
2165 /*pi->next = NULL;*/
2166 free(pi);
2167 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002168}
2169
2170
2171#if !BB_MMU
2172typedef struct nommu_save_t {
2173 char **new_env;
2174 char **old_env;
2175 char **argv;
2176} nommu_save_t;
2177#else
2178#define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \
2179 pseudo_exec_argv(argv, assignment_cnt, argv_expanded)
2180#define pseudo_exec(nommu_save, command, argv_expanded) \
2181 pseudo_exec(command, argv_expanded)
2182#endif
2183
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00002184/* Called after [v]fork() in run_pipe, or from builtin_exec.
Denis Vlasenko8412d792007-10-01 09:59:47 +00002185 * Never returns.
2186 * XXX no exit() here. If you don't exec, use _exit instead.
Eric Andersen94ac2442001-05-22 19:05:18 +00002187 * The at_exit handlers apparently confuse the calling process,
Denis Vlasenko87cb2db2007-04-21 10:00:01 +00002188 * in particular stdin handling. Not sure why? -- because of vfork! (vda) */
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00002189static void pseudo_exec_argv(nommu_save_t *nommu_save,
2190 char **argv, int assignment_cnt,
2191 char **argv_expanded) NORETURN;
2192static void pseudo_exec_argv(nommu_save_t *nommu_save,
2193 char **argv, int assignment_cnt,
2194 char **argv_expanded)
Eric Andersen25f27032001-04-26 23:22:31 +00002195{
Denis Vlasenkof886fd22008-10-13 12:36:05 +00002196 char **new_env;
Denis Vlasenko87cb2db2007-04-21 10:00:01 +00002197
Denis Vlasenko34d4d892009-04-04 20:24:37 +00002198 /* Case when we are here: ... | var=val | ... */
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +00002199 if (!argv[assignment_cnt])
Denis Vlasenko1359da62007-04-21 23:27:30 +00002200 _exit(EXIT_SUCCESS);
Denis Vlasenko87cb2db2007-04-21 10:00:01 +00002201
Denis Vlasenko9504e442008-10-29 01:19:15 +00002202 new_env = expand_assignments(argv, assignment_cnt);
Denis Vlasenkof886fd22008-10-13 12:36:05 +00002203#if BB_MMU
2204 putenv_all(new_env);
2205 free(new_env); /* optional */
2206#else
2207 nommu_save->new_env = new_env;
2208 nommu_save->old_env = putenv_all_and_save_old(new_env);
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +00002209#endif
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +00002210 if (argv_expanded) {
2211 argv = argv_expanded;
2212 } else {
Denis Vlasenko37181682009-04-03 03:19:15 +00002213 argv = expand_strvec_to_strvec(argv + assignment_cnt);
Denis Vlasenko76d50412008-06-10 16:19:39 +00002214#if !BB_MMU
Denis Vlasenkof886fd22008-10-13 12:36:05 +00002215 nommu_save->argv = argv;
Denis Vlasenko76d50412008-06-10 16:19:39 +00002216#endif
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +00002217 }
Denis Vlasenko764d59d2007-05-14 16:23:23 +00002218
Denis Vlasenko34d4d892009-04-04 20:24:37 +00002219 /* On NOMMU, we must never block!
2220 * Example: { sleep 99999 | read line } & echo Ok
2221 * read builtin will block on read syscall, leaving parent blocked
2222 * in vfork. Therefore we can't do this:
2223 */
2224#if BB_MMU
2225 /* Check if the command matches any of the builtins.
Denis Vlasenko1359da62007-04-21 23:27:30 +00002226 * Depending on context, this might be redundant. But it's
2227 * easier to waste a few CPU cycles than it is to figure out
2228 * if this is one of those cases.
2229 */
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00002230 {
2231 int rcode;
2232 const struct built_in_command *x;
2233 for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
2234 if (strcmp(argv[0], x->cmd) == 0) {
2235 debug_printf_exec("running builtin '%s'\n",
2236 argv[0]);
2237 rcode = x->function(argv);
2238 fflush(NULL);
2239 _exit(rcode);
2240 }
Eric Andersen94ac2442001-05-22 19:05:18 +00002241 }
Denis Vlasenko1359da62007-04-21 23:27:30 +00002242 }
Denis Vlasenko34d4d892009-04-04 20:24:37 +00002243#endif
Eric Andersen78a7c992001-05-15 16:30:25 +00002244
Denis Vlasenko80d14be2007-04-10 23:03:30 +00002245#if ENABLE_FEATURE_SH_STANDALONE
Denis Vlasenko34d4d892009-04-04 20:24:37 +00002246 /* Check if the command matches any busybox applets */
Denis Vlasenkoc666f712007-05-16 22:18:54 +00002247 if (strchr(argv[0], '/') == NULL) {
Denis Vlasenko1aa7e472007-11-28 06:49:03 +00002248 int a = find_applet_by_name(argv[0]);
2249 if (a >= 0) {
Denis Vlasenko34d4d892009-04-04 20:24:37 +00002250#if BB_MMU /* see above why on NOMMU it is not allowed */
Denis Vlasenko1aa7e472007-11-28 06:49:03 +00002251 if (APPLET_IS_NOEXEC(a)) {
Denis Vlasenkoc666f712007-05-16 22:18:54 +00002252 debug_printf_exec("running applet '%s'\n", argv[0]);
Denis Vlasenko1aa7e472007-11-28 06:49:03 +00002253 run_applet_no_and_exit(a, argv);
Denis Vlasenkoc666f712007-05-16 22:18:54 +00002254 }
Denis Vlasenko34d4d892009-04-04 20:24:37 +00002255#endif
2256 /* Re-exec ourselves */
Denis Vlasenkoc666f712007-05-16 22:18:54 +00002257 debug_printf_exec("re-execing applet '%s'\n", argv[0]);
Denis Vlasenko34d4d892009-04-04 20:24:37 +00002258 sigprocmask(SIG_SETMASK, &G.inherited_set, NULL);
2259 execv(bb_busybox_exec_path, argv);
Denis Vlasenkoc666f712007-05-16 22:18:54 +00002260 /* If they called chroot or otherwise made the binary no longer
2261 * executable, fall through */
2262 }
2263 }
Eric Andersenaac75e52001-04-30 18:18:45 +00002264#endif
Denis Vlasenkoc666f712007-05-16 22:18:54 +00002265
2266 debug_printf_exec("execing '%s'\n", argv[0]);
Denis Vlasenko34d4d892009-04-04 20:24:37 +00002267 sigprocmask(SIG_SETMASK, &G.inherited_set, NULL);
Denis Vlasenko1359da62007-04-21 23:27:30 +00002268 execvp(argv[0], argv);
Bernhard Reutner-Fischera53de7f2008-07-21 13:46:54 +00002269 bb_perror_msg("can't exec '%s'", argv[0]);
Bernhard Reutner-Fischer636a1f82008-05-19 09:29:47 +00002270 _exit(EXIT_FAILURE);
Denis Vlasenko1359da62007-04-21 23:27:30 +00002271}
2272
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00002273#if BB_MMU
2274static void reset_traps_to_defaults(void)
2275{
2276 unsigned sig;
2277 int dirty;
2278
2279 if (!G.traps)
2280 return;
2281 dirty = 0;
2282 for (sig = 0; sig < NSIG; sig++) {
2283 if (!G.traps[sig])
2284 continue;
2285 free(G.traps[sig]);
2286 G.traps[sig] = NULL;
2287 /* There is no signal for 0 (EXIT) */
2288 if (sig == 0)
2289 continue;
2290 /* there was a trap handler, we are removing it
2291 * (if sig has non-DFL handling,
2292 * we don't need to do anything) */
2293 if (sig < 32 && (G.non_DFL_mask & (1 << sig)))
2294 continue;
2295 sigdelset(&G.blocked_set, sig);
2296 dirty = 1;
2297 }
2298 if (dirty)
2299 sigprocmask(SIG_SETMASK, &G.blocked_set, NULL);
2300}
2301#define clean_up_after_re_execute() ((void)0)
2302
2303#else /* !BB_MMU */
2304
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00002305static void re_execute_shell(const char *s) NORETURN;
2306static void re_execute_shell(const char *s)
2307{
Denis Vlasenko34e573d2009-04-06 12:56:28 +00002308 char param_buf[sizeof("-$%x:%x:%x:%x") + sizeof(unsigned) * 4];
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00002309 struct variable *cur;
Denis Vlasenko30db43b2009-04-05 02:10:39 +00002310 char **argv, **pp, **pp2;
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00002311 unsigned cnt;
2312
Denis Vlasenko0969a492009-04-06 13:05:57 +00002313 sprintf(param_buf, "-$%x:%x:%x" USE_HUSH_LOOPS(":%x")
2314 , (unsigned) G.root_pid
2315 , (unsigned) G.last_bg_pid
2316 , (unsigned) G.last_return_code
2317 USE_HUSH_LOOPS(, G.depth_of_loop)
2318 );
Denis Vlasenko34e573d2009-04-06 12:56:28 +00002319 /* 1:hush 2:-$<pid>:<pid>:<exitcode>:<depth> <vars...>
2320 * 3:-c 4:<cmd> <argN...> 5:NULL
Denis Vlasenko30db43b2009-04-05 02:10:39 +00002321 */
Denis Vlasenko34e573d2009-04-06 12:56:28 +00002322 cnt = 5 + G.global_argc;
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00002323 for (cur = G.top_var; cur; cur = cur->next) {
2324 if (!cur->flg_export || cur->flg_read_only)
2325 cnt += 2;
2326 }
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00002327 G.argv_from_re_execing = pp = xzalloc(sizeof(argv[0]) * cnt);
2328 *pp++ = (char *) G.argv0_for_re_execing;
Denis Vlasenko34e573d2009-04-06 12:56:28 +00002329 *pp++ = param_buf;
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00002330 for (cur = G.top_var; cur; cur = cur->next) {
2331 if (cur->varstr == hush_version_str)
2332 continue;
2333 if (cur->flg_read_only) {
2334 *pp++ = (char *) "-R";
2335 *pp++ = cur->varstr;
2336 } else if (!cur->flg_export) {
2337 *pp++ = (char *) "-V";
2338 *pp++ = cur->varstr;
2339 }
2340 }
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00002341//TODO: pass functions
2342 /* We can pass activated traps here. Say, -Tnn:trap_string
2343 *
2344 * However, POSIX says that subshells reset signals with traps
2345 * to SIG_DFL.
2346 * I tested bash-3.2 and it not only does that with true subshells
2347 * of the form ( list ), but with any forked children shells.
2348 * I set trap "echo W" WINCH; and then tried:
2349 *
2350 * { echo 1; sleep 20; echo 2; } &
2351 * while true; do echo 1; sleep 20; echo 2; break; done &
2352 * true | { echo 1; sleep 20; echo 2; } | cat
2353 *
2354 * In all these cases sending SIGWINCH to the child shell
2355 * did not run the trap. If I add trap "echo V" WINCH;
2356 * _inside_ group (just before echo 1), it works.
2357 *
2358 * I conclude it means we don't need to pass active traps here.
2359 * exec syscall below resets them to SIG_DFL for us.
2360 */
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00002361 *pp++ = (char *) "-c";
2362 *pp++ = (char *) s;
Denis Vlasenko30db43b2009-04-05 02:10:39 +00002363 pp2 = G.global_argv;
2364 while (*pp2)
2365 *pp++ = *pp2++;
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00002366 /* *pp = NULL; - is already there */
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00002367
2368 debug_printf_exec("re_execute_shell pid:%d cmd:'%s'\n", getpid(), s);
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00002369 sigprocmask(SIG_SETMASK, &G.inherited_set, NULL);
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00002370 execv(bb_busybox_exec_path, G.argv_from_re_execing);
2371 /* Fallback. Useful for init=/bin/hush usage etc */
2372 if (G.argv0_for_re_execing[0] == '/')
2373 execv(G.argv0_for_re_execing, G.argv_from_re_execing);
2374 xfunc_error_retval = 127;
2375 bb_error_msg_and_die("can't re-execute the shell");
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00002376}
2377
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00002378static void clean_up_after_re_execute(void)
2379{
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00002380 char **pp = G.argv_from_re_execing;
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00002381 if (pp) {
Denis Vlasenko34e573d2009-04-06 12:56:28 +00002382 /* Must match re_execute_shell's allocations (if any) */
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00002383 free(pp);
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00002384 G.argv_from_re_execing = NULL;
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00002385 }
2386}
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00002387#endif
2388
Denis Vlasenko424f79b2009-03-22 14:23:34 +00002389static int run_list(struct pipe *pi);
2390
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00002391/* Called after [v]fork() in run_pipe
Denis Vlasenko8412d792007-10-01 09:59:47 +00002392 */
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00002393static void pseudo_exec(nommu_save_t *nommu_save,
2394 struct command *command,
2395 char **argv_expanded) NORETURN;
2396static void pseudo_exec(nommu_save_t *nommu_save,
2397 struct command *command,
2398 char **argv_expanded)
Denis Vlasenko1359da62007-04-21 23:27:30 +00002399{
Denis Vlasenko552433b2009-04-04 19:29:21 +00002400 if (command->argv) {
2401 pseudo_exec_argv(nommu_save, command->argv,
2402 command->assignment_cnt, argv_expanded);
2403 }
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00002404
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002405 if (command->group) {
Denis Vlasenko552433b2009-04-04 19:29:21 +00002406 /* Cases when we are here:
2407 * ( list )
2408 * { list } &
2409 * ... | ( list ) | ...
2410 * ... | { list } | ...
2411 */
2412#if BB_MMU
Denis Vlasenko3b492162007-12-24 14:26:57 +00002413 int rcode;
Denis Vlasenko05743d72008-02-10 12:10:08 +00002414 debug_printf_exec("pseudo_exec: run_list\n");
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00002415 reset_traps_to_defaults();
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002416 rcode = run_list(command->group);
Eric Andersenbf7df042001-05-23 22:18:35 +00002417 /* OK to leak memory by not calling free_pipe_list,
Eric Andersen25f27032001-04-26 23:22:31 +00002418 * since this process is about to exit */
Eric Andersen94ac2442001-05-22 19:05:18 +00002419 _exit(rcode);
Denis Vlasenko552433b2009-04-04 19:29:21 +00002420#else
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00002421 re_execute_shell(command->group_as_string);
Denis Vlasenko8412d792007-10-01 09:59:47 +00002422#endif
Eric Andersen25f27032001-04-26 23:22:31 +00002423 }
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00002424
Denis Vlasenko34d4d892009-04-04 20:24:37 +00002425 /* Case when we are here: ... | >file */
2426 debug_printf_exec("pseudo_exec'ed null command\n");
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00002427 _exit(EXIT_SUCCESS);
Eric Andersen25f27032001-04-26 23:22:31 +00002428}
2429
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00002430#if ENABLE_HUSH_JOB
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00002431static const char *get_cmdtext(struct pipe *pi)
2432{
2433 char **argv;
2434 char *p;
2435 int len;
2436
2437 /* This is subtle. ->cmdtext is created only on first backgrounding.
2438 * (Think "cat, <ctrl-z>, fg, <ctrl-z>, fg, <ctrl-z>...." here...)
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002439 * On subsequent bg argv is trashed, but we won't use it */
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00002440 if (pi->cmdtext)
2441 return pi->cmdtext;
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002442 argv = pi->cmds[0].argv;
Denis Vlasenkoa8442002008-06-14 11:00:17 +00002443 if (!argv || !argv[0]) {
2444 pi->cmdtext = xzalloc(1);
2445 return pi->cmdtext;
2446 }
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00002447
2448 len = 0;
2449 do len += strlen(*argv) + 1; while (*++argv);
2450 pi->cmdtext = p = xmalloc(len);
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002451 argv = pi->cmds[0].argv;
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00002452 do {
2453 len = strlen(*argv);
2454 memcpy(p, *argv, len);
2455 p += len;
2456 *p++ = ' ';
2457 } while (*++argv);
2458 p[-1] = '\0';
2459 return pi->cmdtext;
2460}
2461
Eric Andersenbafd94f2001-05-02 16:11:59 +00002462static void insert_bg_job(struct pipe *pi)
2463{
2464 struct pipe *thejob;
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002465 int i;
Eric Andersenbafd94f2001-05-02 16:11:59 +00002466
2467 /* Linear search for the ID of the job to use */
2468 pi->jobid = 1;
Denis Vlasenko87a86552008-07-29 19:43:10 +00002469 for (thejob = G.job_list; thejob; thejob = thejob->next)
Eric Andersenbafd94f2001-05-02 16:11:59 +00002470 if (thejob->jobid >= pi->jobid)
2471 pi->jobid = thejob->jobid + 1;
2472
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002473 /* Add thejob to the list of running jobs */
Denis Vlasenko87a86552008-07-29 19:43:10 +00002474 if (!G.job_list) {
2475 thejob = G.job_list = xmalloc(sizeof(*thejob));
Eric Andersenbafd94f2001-05-02 16:11:59 +00002476 } else {
Denis Vlasenko87a86552008-07-29 19:43:10 +00002477 for (thejob = G.job_list; thejob->next; thejob = thejob->next)
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00002478 continue;
Eric Andersenbafd94f2001-05-02 16:11:59 +00002479 thejob->next = xmalloc(sizeof(*thejob));
2480 thejob = thejob->next;
2481 }
2482
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002483 /* Physically copy the struct job */
Eric Andersen0fcd4472001-05-02 20:12:03 +00002484 memcpy(thejob, pi, sizeof(struct pipe));
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002485 thejob->cmds = xzalloc(sizeof(pi->cmds[0]) * pi->num_cmds);
2486 /* We cannot copy entire pi->cmds[] vector! Double free()s will happen */
2487 for (i = 0; i < pi->num_cmds; i++) {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002488// TODO: do we really need to have so many fields which are just dead weight
2489// at execution stage?
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002490 thejob->cmds[i].pid = pi->cmds[i].pid;
Denis Vlasenkoc666f712007-05-16 22:18:54 +00002491 /* all other fields are not used and stay zero */
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002492 }
Eric Andersenbafd94f2001-05-02 16:11:59 +00002493 thejob->next = NULL;
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00002494 thejob->cmdtext = xstrdup(get_cmdtext(pi));
Eric Andersenbafd94f2001-05-02 16:11:59 +00002495
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002496 /* We don't wait for background thejobs to return -- append it
Eric Andersenbafd94f2001-05-02 16:11:59 +00002497 to the list of backgrounded thejobs and leave it alone */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00002498 if (G_interactive_fd)
Mike Frysinger87824e02009-03-30 00:19:30 +00002499 printf("[%d] %d %s\n", thejob->jobid, thejob->cmds[0].pid, thejob->cmdtext);
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002500 G.last_bg_pid = thejob->cmds[0].pid;
Denis Vlasenko87a86552008-07-29 19:43:10 +00002501 G.last_jobid = thejob->jobid;
Eric Andersenbafd94f2001-05-02 16:11:59 +00002502}
2503
Eric Andersenbafd94f2001-05-02 16:11:59 +00002504static void remove_bg_job(struct pipe *pi)
2505{
2506 struct pipe *prev_pipe;
2507
Denis Vlasenko87a86552008-07-29 19:43:10 +00002508 if (pi == G.job_list) {
2509 G.job_list = pi->next;
Eric Andersenbafd94f2001-05-02 16:11:59 +00002510 } else {
Denis Vlasenko87a86552008-07-29 19:43:10 +00002511 prev_pipe = G.job_list;
Eric Andersenbafd94f2001-05-02 16:11:59 +00002512 while (prev_pipe->next != pi)
2513 prev_pipe = prev_pipe->next;
2514 prev_pipe->next = pi->next;
2515 }
Denis Vlasenko87a86552008-07-29 19:43:10 +00002516 if (G.job_list)
2517 G.last_jobid = G.job_list->jobid;
Eric Andersen028b65b2001-06-28 01:10:11 +00002518 else
Denis Vlasenko87a86552008-07-29 19:43:10 +00002519 G.last_jobid = 0;
Denis Vlasenko1359da62007-04-21 23:27:30 +00002520}
Eric Andersen028b65b2001-06-28 01:10:11 +00002521
Denis Vlasenko003f9fb2008-06-24 00:47:58 +00002522/* Remove a backgrounded job */
Denis Vlasenko1359da62007-04-21 23:27:30 +00002523static void delete_finished_bg_job(struct pipe *pi)
2524{
2525 remove_bg_job(pi);
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002526 pi->stopped_cmds = 0;
Eric Andersenbf7df042001-05-23 22:18:35 +00002527 free_pipe(pi, 0);
Eric Andersenbafd94f2001-05-02 16:11:59 +00002528 free(pi);
2529}
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002530#endif /* JOB */
Eric Andersenbafd94f2001-05-02 16:11:59 +00002531
Denis Vlasenko003f9fb2008-06-24 00:47:58 +00002532/* Check to see if any processes have exited -- if they
2533 * have, figure out why and see if a job has completed */
Eric Andersenc798b072001-06-22 06:23:03 +00002534static int checkjobs(struct pipe* fg_pipe)
Eric Andersenbafd94f2001-05-02 16:11:59 +00002535{
Eric Andersenc798b072001-06-22 06:23:03 +00002536 int attributes;
2537 int status;
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00002538#if ENABLE_HUSH_JOB
Eric Andersenbafd94f2001-05-02 16:11:59 +00002539 struct pipe *pi;
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00002540#endif
Eric Andersenbafd94f2001-05-02 16:11:59 +00002541 pid_t childpid;
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00002542 int rcode = 0;
Eric Andersenbafd94f2001-05-02 16:11:59 +00002543
Denis Vlasenkod5762932009-03-31 11:22:57 +00002544 debug_printf_jobs("checkjobs %p\n", fg_pipe);
2545
Denis Vlasenko7566bae2009-03-31 17:24:49 +00002546 errno = 0;
2547// if (G.handled_SIGCHLD == G.count_SIGCHLD)
2548// /* avoid doing syscall, nothing there anyway */
2549// return rcode;
2550
Eric Andersenc798b072001-06-22 06:23:03 +00002551 attributes = WUNTRACED;
Denis Vlasenko003f9fb2008-06-24 00:47:58 +00002552 if (fg_pipe == NULL)
Eric Andersenc798b072001-06-22 06:23:03 +00002553 attributes |= WNOHANG;
Eric Andersenc798b072001-06-22 06:23:03 +00002554
Denis Vlasenko1359da62007-04-21 23:27:30 +00002555/* Do we do this right?
2556 * bash-3.00# sleep 20 | false
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00002557 * <ctrl-Z pressed>
Denis Vlasenko1359da62007-04-21 23:27:30 +00002558 * [3]+ Stopped sleep 20 | false
2559 * bash-3.00# echo $?
2560 * 1 <========== bg pipe is not fully done, but exitcode is already known!
2561 */
2562
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00002563//FIXME: non-interactive bash does not continue even if all processes in fg pipe
2564//are stopped. Testcase: "cat | cat" in a script (not on command line)
2565// + killall -STOP cat
2566
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00002567 wait_more:
Denis Vlasenko7566bae2009-03-31 17:24:49 +00002568 while (1) {
Denis Vlasenko003f9fb2008-06-24 00:47:58 +00002569 int i;
Denis Vlasenko7566bae2009-03-31 17:24:49 +00002570 int dead;
2571
2572// i = G.count_SIGCHLD;
2573 childpid = waitpid(-1, &status, attributes);
2574 if (childpid <= 0) {
2575 if (childpid && errno != ECHILD)
2576 bb_perror_msg("waitpid");
2577// else /* Until next SIGCHLD, waitpid's are useless */
2578// G.handled_SIGCHLD = i;
2579 break;
2580 }
2581 dead = WIFEXITED(status) || WIFSIGNALED(status);
2582
Denis Vlasenkob61e13d2008-06-17 05:11:43 +00002583#if DEBUG_JOBS
Denis Vlasenko1359da62007-04-21 23:27:30 +00002584 if (WIFSTOPPED(status))
Denis Vlasenkod01ff132007-05-02 21:40:23 +00002585 debug_printf_jobs("pid %d stopped by sig %d (exitcode %d)\n",
Denis Vlasenko1359da62007-04-21 23:27:30 +00002586 childpid, WSTOPSIG(status), WEXITSTATUS(status));
2587 if (WIFSIGNALED(status))
Denis Vlasenkod01ff132007-05-02 21:40:23 +00002588 debug_printf_jobs("pid %d killed by sig %d (exitcode %d)\n",
Denis Vlasenko1359da62007-04-21 23:27:30 +00002589 childpid, WTERMSIG(status), WEXITSTATUS(status));
2590 if (WIFEXITED(status))
Denis Vlasenkod01ff132007-05-02 21:40:23 +00002591 debug_printf_jobs("pid %d exited, exitcode %d\n",
Denis Vlasenko1359da62007-04-21 23:27:30 +00002592 childpid, WEXITSTATUS(status));
2593#endif
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00002594 /* Were we asked to wait for fg pipe? */
Eric Andersenc798b072001-06-22 06:23:03 +00002595 if (fg_pipe) {
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002596 for (i = 0; i < fg_pipe->num_cmds; i++) {
2597 debug_printf_jobs("check pid %d\n", fg_pipe->cmds[i].pid);
2598 if (fg_pipe->cmds[i].pid != childpid)
Denis Vlasenko003f9fb2008-06-24 00:47:58 +00002599 continue;
2600 /* printf("process %d exit %d\n", i, WEXITSTATUS(status)); */
2601 if (dead) {
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002602 fg_pipe->cmds[i].pid = 0;
2603 fg_pipe->alive_cmds--;
2604 if (i == fg_pipe->num_cmds - 1) {
Denis Vlasenko003f9fb2008-06-24 00:47:58 +00002605 /* last process gives overall exitstatus */
2606 rcode = WEXITSTATUS(status);
Denis Vlasenko5ec61322008-06-24 00:50:07 +00002607 IF_HAS_KEYWORDS(if (fg_pipe->pi_inverted) rcode = !rcode;)
Denis Vlasenko1359da62007-04-21 23:27:30 +00002608 }
Denis Vlasenko003f9fb2008-06-24 00:47:58 +00002609 } else {
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002610 fg_pipe->cmds[i].is_stopped = 1;
2611 fg_pipe->stopped_cmds++;
Eric Andersenc798b072001-06-22 06:23:03 +00002612 }
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002613 debug_printf_jobs("fg_pipe: alive_cmds %d stopped_cmds %d\n",
2614 fg_pipe->alive_cmds, fg_pipe->stopped_cmds);
2615 if (fg_pipe->alive_cmds - fg_pipe->stopped_cmds <= 0) {
Denis Vlasenko003f9fb2008-06-24 00:47:58 +00002616 /* All processes in fg pipe have exited/stopped */
2617#if ENABLE_HUSH_JOB
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002618 if (fg_pipe->alive_cmds)
Denis Vlasenko003f9fb2008-06-24 00:47:58 +00002619 insert_bg_job(fg_pipe);
2620#endif
2621 return rcode;
2622 }
2623 /* There are still running processes in the fg pipe */
2624 goto wait_more; /* do waitpid again */
Eric Andersenc798b072001-06-22 06:23:03 +00002625 }
Denis Vlasenko003f9fb2008-06-24 00:47:58 +00002626 /* it wasnt fg_pipe, look for process in bg pipes */
Eric Andersenc798b072001-06-22 06:23:03 +00002627 }
2628
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00002629#if ENABLE_HUSH_JOB
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00002630 /* We asked to wait for bg or orphaned children */
2631 /* No need to remember exitcode in this case */
Denis Vlasenko87a86552008-07-29 19:43:10 +00002632 for (pi = G.job_list; pi; pi = pi->next) {
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002633 for (i = 0; i < pi->num_cmds; i++) {
2634 if (pi->cmds[i].pid == childpid)
Denis Vlasenko5f786c22007-04-20 08:35:45 +00002635 goto found_pi_and_prognum;
Eric Andersen52a97ca2001-06-22 06:49:26 +00002636 }
Eric Andersenbafd94f2001-05-02 16:11:59 +00002637 }
Denis Vlasenko5f786c22007-04-20 08:35:45 +00002638 /* Happens when shell is used as init process (init=/bin/sh) */
2639 debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
Denis Vlasenko003f9fb2008-06-24 00:47:58 +00002640 continue; /* do waitpid again */
Eric Andersenaeb44c42001-05-22 20:29:00 +00002641
Denis Vlasenko5f786c22007-04-20 08:35:45 +00002642 found_pi_and_prognum:
Denis Vlasenko1359da62007-04-21 23:27:30 +00002643 if (dead) {
Eric Andersenbafd94f2001-05-02 16:11:59 +00002644 /* child exited */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002645 pi->cmds[i].pid = 0;
2646 pi->alive_cmds--;
2647 if (!pi->alive_cmds) {
Denis Vlasenko60b392f2009-04-03 19:14:32 +00002648 if (G_interactive_fd)
Mike Frysinger87824e02009-03-30 00:19:30 +00002649 printf(JOB_STATUS_FORMAT, pi->jobid,
2650 "Done", pi->cmdtext);
Denis Vlasenko1359da62007-04-21 23:27:30 +00002651 delete_finished_bg_job(pi);
Eric Andersenbafd94f2001-05-02 16:11:59 +00002652 }
2653 } else {
2654 /* child stopped */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002655 pi->cmds[i].is_stopped = 1;
2656 pi->stopped_cmds++;
Eric Andersenbafd94f2001-05-02 16:11:59 +00002657 }
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00002658#endif
Denis Vlasenko003f9fb2008-06-24 00:47:58 +00002659 } /* while (waitpid succeeds)... */
Eric Andersenbafd94f2001-05-02 16:11:59 +00002660
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00002661 return rcode;
Eric Andersenada18ff2001-05-21 16:18:22 +00002662}
2663
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00002664#if ENABLE_HUSH_JOB
Denis Vlasenko52881e92007-04-21 13:42:52 +00002665static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
2666{
2667 pid_t p;
2668 int rcode = checkjobs(fg_pipe);
2669 /* Job finished, move the shell to the foreground */
Denis Vlasenko170435c2007-05-23 13:01:10 +00002670 p = getpgid(0); /* pgid of our process */
2671 debug_printf_jobs("fg'ing ourself: getpgid(0)=%d\n", (int)p);
Denis Vlasenko60b392f2009-04-03 19:14:32 +00002672 tcsetpgrp(G_interactive_fd, p);
Denis Vlasenko52881e92007-04-21 13:42:52 +00002673 return rcode;
2674}
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00002675#endif
Denis Vlasenko52881e92007-04-21 13:42:52 +00002676
Denis Vlasenko34d4d892009-04-04 20:24:37 +00002677/* Start all the jobs, but don't wait for anything to finish.
2678 * See checkjobs().
Eric Andersen25f27032001-04-26 23:22:31 +00002679 *
Denis Vlasenko552433b2009-04-04 19:29:21 +00002680 * Return code is normally -1, when the caller has to wait for children
Eric Andersen25f27032001-04-26 23:22:31 +00002681 * to finish to determine the exit status of the pipe. If the pipe
2682 * is a simple builtin command, however, the action is done by the
Denis Vlasenko05743d72008-02-10 12:10:08 +00002683 * time run_pipe returns, and the exit code is provided as the
Eric Andersen25f27032001-04-26 23:22:31 +00002684 * return value.
2685 *
Denis Vlasenko170435c2007-05-23 13:01:10 +00002686 * Returns -1 only if started some children. IOW: we have to
2687 * mask out retvals of builtins etc with 0xff!
Denis Vlasenko552433b2009-04-04 19:29:21 +00002688 *
2689 * The only case when we do not need to [v]fork is when the pipe
2690 * is single, non-backgrounded, non-subshell command. Examples:
2691 * cmd ; ... { list } ; ...
2692 * cmd && ... { list } && ...
2693 * cmd || ... { list } || ...
2694 * If it is, then we can run cmd as a builtin, NOFORK [do we do this?],
2695 * or (if SH_STANDALONE) an applet, and we can run the { list }
Denis Vlasenko34d4d892009-04-04 20:24:37 +00002696 * with run_list(). If it isn't one of these, we fork and exec cmd.
Denis Vlasenko552433b2009-04-04 19:29:21 +00002697 *
2698 * Cases when we must fork:
2699 * non-single: cmd | cmd
2700 * backgrounded: cmd & { list } &
2701 * subshell: ( list ) [&]
Eric Andersen25f27032001-04-26 23:22:31 +00002702 */
Denis Vlasenko05743d72008-02-10 12:10:08 +00002703static int run_pipe(struct pipe *pi)
Eric Andersen25f27032001-04-26 23:22:31 +00002704{
Denis Vlasenko552433b2009-04-04 19:29:21 +00002705 static const char *const null_ptr = NULL;
Eric Andersen25f27032001-04-26 23:22:31 +00002706 int i;
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002707 int nextin;
2708 int pipefds[2]; /* pipefds[0] is for reading */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002709 struct command *command;
Denis Vlasenko22d10a02008-10-13 08:53:43 +00002710 char **argv_expanded;
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +00002711 char **argv;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00002712 char *p;
Denis Vlasenkof5294e12007-04-14 10:09:57 +00002713 /* it is not always needed, but we aim to smaller code */
2714 int squirrel[] = { -1, -1, -1 };
2715 int rcode;
Eric Andersen25f27032001-04-26 23:22:31 +00002716
Denis Vlasenko552433b2009-04-04 19:29:21 +00002717 debug_printf_exec("run_pipe start: members:%d\n", pi->num_cmds);
Denis Vlasenko4ac530c2007-05-02 15:35:45 +00002718
Denis Vlasenko552433b2009-04-04 19:29:21 +00002719 USE_HUSH_JOB(pi->pgrp = -1;)
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002720 pi->stopped_cmds = 0;
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002721 command = &(pi->cmds[0]);
Denis Vlasenko552433b2009-04-04 19:29:21 +00002722 argv_expanded = NULL;
Denis Vlasenko22d10a02008-10-13 08:53:43 +00002723
Denis Vlasenko552433b2009-04-04 19:29:21 +00002724 if (pi->num_cmds != 1
2725 || pi->followup == PIPE_BG
2726 || command->grp_type == GRP_SUBSHELL
2727 ) {
2728 goto must_fork;
Denis Vlasenko371de4a2008-10-14 12:43:13 +00002729 }
Denis Vlasenko371de4a2008-10-14 12:43:13 +00002730
Denis Vlasenko552433b2009-04-04 19:29:21 +00002731 pi->alive_cmds = 1;
2732
2733 debug_printf_exec(": group:%p argv:'%s'\n",
2734 command->group, command->argv ? command->argv[0] : "NONE");
2735
2736 if (command->group) {
2737#if ENABLE_HUSH_FUNCTIONS
2738 if (command->grp_type == GRP_FUNCTION) {
2739 /* func () { list } */
2740 bb_error_msg("here we ought to remember function definition, and go on");
2741 return EXIT_SUCCESS;
2742 }
2743#endif
2744 /* { list } */
2745 debug_printf("non-subshell group\n");
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002746 setup_redirects(command, squirrel);
Denis Vlasenko05743d72008-02-10 12:10:08 +00002747 debug_printf_exec(": run_list\n");
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002748 rcode = run_list(command->group) & 0xff;
Eric Andersen04407e52001-06-07 16:42:05 +00002749 restore_redirects(squirrel);
Denis Vlasenko05743d72008-02-10 12:10:08 +00002750 debug_printf_exec("run_pipe return %d\n", rcode);
Denis Vlasenko5ec61322008-06-24 00:50:07 +00002751 IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
Denis Vlasenko05743d72008-02-10 12:10:08 +00002752 return rcode;
Denis Vlasenkof03dbed2007-04-13 19:55:50 +00002753 }
2754
Denis Vlasenko552433b2009-04-04 19:29:21 +00002755 argv = command->argv ? command->argv : (char **) &null_ptr;
2756 {
2757 const struct built_in_command *x;
Denis Vlasenko22d10a02008-10-13 08:53:43 +00002758 char **new_env = NULL;
2759 char **old_env = NULL;
2760
Denis Vlasenko552433b2009-04-04 19:29:21 +00002761 if (argv[command->assignment_cnt] == NULL) {
2762 /* Assignments, but no command */
2763 /* Ensure redirects take effect. Try "a=t >file" */
2764 setup_redirects(command, squirrel);
2765 restore_redirects(squirrel);
2766 /* Set shell variables */
2767 while (*argv) {
2768 p = expand_string_to_string(*argv);
2769 debug_printf_exec("set shell var:'%s'->'%s'\n",
2770 *argv, p);
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00002771 set_local_var(p, 0, 0);
Denis Vlasenko552433b2009-04-04 19:29:21 +00002772 argv++;
Eric Andersen78a7c992001-05-15 16:30:25 +00002773 }
Denis Vlasenko552433b2009-04-04 19:29:21 +00002774 /* Do we need to flag set_local_var() errors?
2775 * "assignment to readonly var" and "putenv error"
2776 */
2777 return EXIT_SUCCESS;
Eric Andersen78a7c992001-05-15 16:30:25 +00002778 }
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +00002779
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +00002780 /* Expand the rest into (possibly) many strings each */
Denis Vlasenko552433b2009-04-04 19:29:21 +00002781 argv_expanded = expand_strvec_to_strvec(argv + command->assignment_cnt);
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +00002782
Denis Vlasenkodd316dd2008-06-14 15:50:55 +00002783 for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
Denis Vlasenko22d10a02008-10-13 08:53:43 +00002784 if (strcmp(argv_expanded[0], x->cmd) != 0)
2785 continue;
2786 if (x->function == builtin_exec && argv_expanded[1] == NULL) {
2787 debug_printf("exec with redirects only\n");
2788 setup_redirects(command, NULL);
2789 rcode = EXIT_SUCCESS;
2790 goto clean_up_and_ret1;
Eric Andersen25f27032001-04-26 23:22:31 +00002791 }
Denis Vlasenko22d10a02008-10-13 08:53:43 +00002792 debug_printf("builtin inline %s\n", argv_expanded[0]);
2793 /* XXX setup_redirects acts on file descriptors, not FILEs.
2794 * This is perfect for work that comes after exec().
2795 * Is it really safe for inline use? Experimentally,
2796 * things seem to work with glibc. */
2797 setup_redirects(command, squirrel);
2798 new_env = expand_assignments(argv, command->assignment_cnt);
2799 old_env = putenv_all_and_save_old(new_env);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00002800 debug_printf_exec(": builtin '%s' '%s'...\n",
2801 x->cmd, argv_expanded[1]);
Denis Vlasenko22d10a02008-10-13 08:53:43 +00002802 rcode = x->function(argv_expanded) & 0xff;
Denis Vlasenkof886fd22008-10-13 12:36:05 +00002803#if ENABLE_FEATURE_SH_STANDALONE
2804 clean_up_and_ret:
2805#endif
Denis Vlasenko22d10a02008-10-13 08:53:43 +00002806 restore_redirects(squirrel);
2807 free_strings_and_unsetenv(new_env, 1);
2808 putenv_all(old_env);
Denis Vlasenkof886fd22008-10-13 12:36:05 +00002809 free(old_env); /* not free_strings()! */
Denis Vlasenko22d10a02008-10-13 08:53:43 +00002810 clean_up_and_ret1:
2811 free(argv_expanded);
2812 IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
2813 debug_printf_exec("run_pipe return %d\n", rcode);
2814 return rcode;
Eric Andersen25f27032001-04-26 23:22:31 +00002815 }
Denis Vlasenkof5294e12007-04-14 10:09:57 +00002816#if ENABLE_FEATURE_SH_STANDALONE
Denis Vlasenko22d10a02008-10-13 08:53:43 +00002817 i = find_applet_by_name(argv_expanded[0]);
2818 if (i >= 0 && APPLET_IS_NOFORK(i)) {
2819 setup_redirects(command, squirrel);
2820 save_nofork_data(&G.nofork_save);
2821 new_env = expand_assignments(argv, command->assignment_cnt);
2822 old_env = putenv_all_and_save_old(new_env);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00002823 debug_printf_exec(": run_nofork_applet '%s' '%s'...\n",
2824 argv_expanded[0], argv_expanded[1]);
Denis Vlasenko22d10a02008-10-13 08:53:43 +00002825 rcode = run_nofork_applet_prime(&G.nofork_save, i, argv_expanded);
2826 goto clean_up_and_ret;
Denis Vlasenkof5294e12007-04-14 10:09:57 +00002827 }
2828#endif
Denis Vlasenko552433b2009-04-04 19:29:21 +00002829 /* It is neither builtin nor applet. We must fork. */
Eric Andersen25f27032001-04-26 23:22:31 +00002830 }
2831
Denis Vlasenko552433b2009-04-04 19:29:21 +00002832 must_fork:
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +00002833 /* NB: argv_expanded may already be created, and that
2834 * might include `cmd` runs! Do not rerun it! We *must*
2835 * use argv_expanded if it's non-NULL */
2836
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002837 /* Going to fork a child per each pipe member */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002838 pi->alive_cmds = 0;
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002839 nextin = 0;
2840
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002841 for (i = 0; i < pi->num_cmds; i++) {
Denis Vlasenko76d50412008-06-10 16:19:39 +00002842#if !BB_MMU
Denis Vlasenkof886fd22008-10-13 12:36:05 +00002843 volatile nommu_save_t nommu_save;
2844 nommu_save.new_env = NULL;
2845 nommu_save.old_env = NULL;
2846 nommu_save.argv = NULL;
Denis Vlasenko76d50412008-06-10 16:19:39 +00002847#endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002848 command = &(pi->cmds[i]);
2849 if (command->argv) {
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00002850 debug_printf_exec(": pipe member '%s' '%s'...\n",
2851 command->argv[0], command->argv[1]);
Denis Vlasenko552433b2009-04-04 19:29:21 +00002852 } else {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002853 debug_printf_exec(": pipe member with no argv\n");
Denis Vlasenko552433b2009-04-04 19:29:21 +00002854 }
Eric Andersen25f27032001-04-26 23:22:31 +00002855
2856 /* pipes are inserted between pairs of commands */
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002857 pipefds[0] = 0;
2858 pipefds[1] = 1;
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002859 if ((i + 1) < pi->num_cmds)
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002860 xpipe(pipefds);
Eric Andersen25f27032001-04-26 23:22:31 +00002861
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002862 command->pid = BB_MMU ? fork() : vfork();
2863 if (!command->pid) { /* child */
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002864#if ENABLE_HUSH_JOB
Denis Vlasenkof9375282009-04-05 19:13:39 +00002865 die_sleep = 0; /* do not restore tty pgrp on xfunc death */
Denis Vlasenkod5762932009-03-31 11:22:57 +00002866
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00002867 /* Every child adds itself to new process group
Denis Vlasenko05743d72008-02-10 12:10:08 +00002868 * with pgid == pid_of_first_child_in_pipe */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00002869 if (G.run_list_level == 1 && G_interactive_fd) {
Denis Vlasenko05743d72008-02-10 12:10:08 +00002870 pid_t pgrp;
Denis Vlasenko05743d72008-02-10 12:10:08 +00002871 pgrp = pi->pgrp;
2872 if (pgrp < 0) /* true for 1st process only */
2873 pgrp = getpid();
2874 if (setpgid(0, pgrp) == 0 && pi->followup != PIPE_BG) {
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00002875 /* We do it in *every* child, not just first,
2876 * to avoid races */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00002877 tcsetpgrp(G_interactive_fd, pgrp);
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00002878 }
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00002879 }
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00002880#endif
Denis Vlasenko8412d792007-10-01 09:59:47 +00002881 xmove_fd(nextin, 0);
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002882 xmove_fd(pipefds[1], 1); /* write end */
2883 if (pipefds[0] > 1)
2884 close(pipefds[0]); /* read end */
Eric Andersen25f27032001-04-26 23:22:31 +00002885 /* Like bash, explicit redirects override pipes,
2886 * and the pipe fd is available for dup'ing. */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002887 setup_redirects(command, NULL);
Eric Andersen52a97ca2001-06-22 06:49:26 +00002888
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00002889 /* Restore default handlers just prior to exec */
Denis Vlasenkoabedaac2009-03-31 12:03:40 +00002890 /*signal(SIGCHLD, SIG_DFL); - so far we don't have any handlers */
2891
Denis Vlasenkof886fd22008-10-13 12:36:05 +00002892 /* Stores to nommu_save list of env vars putenv'ed
2893 * (NOMMU, on MMU we don't need that) */
2894 /* cast away volatility... */
2895 pseudo_exec((nommu_save_t*) &nommu_save, command, argv_expanded);
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +00002896 /* pseudo_exec() does not return */
Eric Andersen25f27032001-04-26 23:22:31 +00002897 }
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00002898
Denis Vlasenkof9375282009-04-05 19:13:39 +00002899 /* parent or error */
2900#if ENABLE_HUSH_JOB
2901 die_sleep = -1; /* restore tty pgrp on xfunc death */
2902#endif
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +00002903#if !BB_MMU
Denis Vlasenkof886fd22008-10-13 12:36:05 +00002904 /* Clean up after vforked child */
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00002905 clean_up_after_re_execute();
Denis Vlasenkof886fd22008-10-13 12:36:05 +00002906 free(nommu_save.argv);
2907 free_strings_and_unsetenv(nommu_save.new_env, 1);
2908 putenv_all(nommu_save.old_env);
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +00002909#endif
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +00002910 free(argv_expanded);
2911 argv_expanded = NULL;
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002912 if (command->pid < 0) { /* [v]fork failed */
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002913 /* Clearly indicate, was it fork or vfork */
Denis Vlasenko82604e92008-07-01 15:59:42 +00002914 bb_perror_msg(BB_MMU ? "fork" : "vfork");
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002915 } else {
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002916 pi->alive_cmds++;
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00002917#if ENABLE_HUSH_JOB
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002918 /* Second and next children need to know pid of first one */
2919 if (pi->pgrp < 0)
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002920 pi->pgrp = command->pid;
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00002921#endif
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002922 }
Eric Andersen25f27032001-04-26 23:22:31 +00002923
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002924 if (i)
2925 close(nextin);
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002926 if ((i + 1) < pi->num_cmds)
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002927 close(pipefds[1]); /* write end */
2928 /* Pass read (output) pipe end to next iteration */
Eric Andersen25f27032001-04-26 23:22:31 +00002929 nextin = pipefds[0];
2930 }
Denis Vlasenkod2c450c2008-01-08 20:32:12 +00002931
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002932 if (!pi->alive_cmds) {
Denis Vlasenko05743d72008-02-10 12:10:08 +00002933 debug_printf_exec("run_pipe return 1 (all forks failed, no children)\n");
2934 return 1;
2935 }
2936
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002937 debug_printf_exec("run_pipe return -1 (%u children started)\n", pi->alive_cmds);
Eric Andersen25f27032001-04-26 23:22:31 +00002938 return -1;
2939}
2940
Denis Vlasenko4b924f32007-05-30 00:29:55 +00002941#ifndef debug_print_tree
Denis Vlasenko400c5b62007-05-04 13:07:27 +00002942static void debug_print_tree(struct pipe *pi, int lvl)
2943{
Denis Vlasenko371de4a2008-10-14 12:43:13 +00002944 static const char *const PIPE[] = {
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00002945 [PIPE_SEQ] = "SEQ",
2946 [PIPE_AND] = "AND",
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00002947 [PIPE_OR ] = "OR" ,
2948 [PIPE_BG ] = "BG" ,
Denis Vlasenko400c5b62007-05-04 13:07:27 +00002949 };
2950 static const char *RES[] = {
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00002951 [RES_NONE ] = "NONE" ,
Denis Vlasenko06810332007-05-21 23:30:54 +00002952#if ENABLE_HUSH_IF
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00002953 [RES_IF ] = "IF" ,
2954 [RES_THEN ] = "THEN" ,
2955 [RES_ELIF ] = "ELIF" ,
2956 [RES_ELSE ] = "ELSE" ,
2957 [RES_FI ] = "FI" ,
Denis Vlasenko06810332007-05-21 23:30:54 +00002958#endif
2959#if ENABLE_HUSH_LOOPS
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00002960 [RES_FOR ] = "FOR" ,
2961 [RES_WHILE] = "WHILE",
2962 [RES_UNTIL] = "UNTIL",
2963 [RES_DO ] = "DO" ,
2964 [RES_DONE ] = "DONE" ,
Denis Vlasenkod91afa32008-07-29 11:10:01 +00002965#endif
2966#if ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00002967 [RES_IN ] = "IN" ,
Denis Vlasenko06810332007-05-21 23:30:54 +00002968#endif
Denis Vlasenko17f02e72008-07-14 04:32:29 +00002969#if ENABLE_HUSH_CASE
2970 [RES_CASE ] = "CASE" ,
2971 [RES_MATCH] = "MATCH",
2972 [RES_CASEI] = "CASEI",
2973 [RES_ESAC ] = "ESAC" ,
2974#endif
Denis Vlasenko06810332007-05-21 23:30:54 +00002975 [RES_XXXX ] = "XXXX" ,
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00002976 [RES_SNTX ] = "SNTX" ,
Denis Vlasenko400c5b62007-05-04 13:07:27 +00002977 };
Denis Vlasenko371de4a2008-10-14 12:43:13 +00002978 static const char *const GRPTYPE[] = {
Denis Vlasenko371de4a2008-10-14 12:43:13 +00002979 "{}",
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00002980 "()",
Denis Vlasenko371de4a2008-10-14 12:43:13 +00002981#if ENABLE_HUSH_FUNCTIONS
2982 "func()",
2983#endif
2984 };
Denis Vlasenko400c5b62007-05-04 13:07:27 +00002985
2986 int pin, prn;
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002987
Denis Vlasenko400c5b62007-05-04 13:07:27 +00002988 pin = 0;
2989 while (pi) {
Denis Vlasenko219e88d2007-05-21 10:18:23 +00002990 fprintf(stderr, "%*spipe %d res_word=%s followup=%d %s\n", lvl*2, "",
2991 pin, RES[pi->res_word], pi->followup, PIPE[pi->followup]);
Denis Vlasenko400c5b62007-05-04 13:07:27 +00002992 prn = 0;
Denis Vlasenko9af22c72008-10-09 12:54:58 +00002993 while (prn < pi->num_cmds) {
2994 struct command *command = &pi->cmds[prn];
2995 char **argv = command->argv;
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00002996
Denis Vlasenkocd418a22009-04-06 18:08:35 +00002997 fprintf(stderr, "%*s cmd %d assignment_cnt:%d",
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00002998 lvl*2, "", prn,
2999 command->assignment_cnt);
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003000 if (command->group) {
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00003001 fprintf(stderr, " group %s: (argv=%p)\n",
Denis Vlasenko371de4a2008-10-14 12:43:13 +00003002 GRPTYPE[command->grp_type],
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00003003 argv);
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003004 debug_print_tree(command->group, lvl+1);
Denis Vlasenko400c5b62007-05-04 13:07:27 +00003005 prn++;
3006 continue;
3007 }
Denis Vlasenko400c5b62007-05-04 13:07:27 +00003008 if (argv) while (*argv) {
3009 fprintf(stderr, " '%s'", *argv);
3010 argv++;
Denis Vlasenko4b924f32007-05-30 00:29:55 +00003011 }
Denis Vlasenko400c5b62007-05-04 13:07:27 +00003012 fprintf(stderr, "\n");
3013 prn++;
3014 }
3015 pi = pi->next;
3016 pin++;
3017 }
3018}
3019#endif
3020
Denis Vlasenkoc666f712007-05-16 22:18:54 +00003021/* NB: called by pseudo_exec, and therefore must not modify any
3022 * global data until exec/_exit (we can be a child after vfork!) */
Denis Vlasenko05743d72008-02-10 12:10:08 +00003023static int run_list(struct pipe *pi)
Eric Andersen25f27032001-04-26 23:22:31 +00003024{
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003025#if ENABLE_HUSH_CASE
3026 char *case_word = NULL;
3027#endif
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003028#if ENABLE_HUSH_LOOPS
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003029 struct pipe *loop_top = NULL;
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003030 char *for_varname = NULL;
3031 char **for_lcur = NULL;
3032 char **for_list = NULL;
Denis Vlasenko06810332007-05-21 23:30:54 +00003033#endif
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003034 smallint last_followup;
3035 smalluint rcode;
Denis Vlasenkod91afa32008-07-29 11:10:01 +00003036#if ENABLE_HUSH_IF || ENABLE_HUSH_CASE
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003037 smalluint cond_code = 0;
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003038#else
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003039 enum { cond_code = 0 };
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003040#endif
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003041 smallint rword; /* enum reserved_style */
3042 smallint last_rword; /* ditto */
Denis Vlasenko4ac530c2007-05-02 15:35:45 +00003043
Denis Vlasenko87a86552008-07-29 19:43:10 +00003044 debug_printf_exec("run_list start lvl %d\n", G.run_list_level + 1);
Denis Vlasenko4ac530c2007-05-02 15:35:45 +00003045
Denis Vlasenko06810332007-05-21 23:30:54 +00003046#if ENABLE_HUSH_LOOPS
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003047 /* Check syntax for "for" */
Denis Vlasenkocf22c892008-07-28 15:17:44 +00003048 for (struct pipe *cpipe = pi; cpipe; cpipe = cpipe->next) {
3049 if (cpipe->res_word != RES_FOR && cpipe->res_word != RES_IN)
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003050 continue;
3051 /* current word is FOR or IN (BOLD in comments below) */
Denis Vlasenkocf22c892008-07-28 15:17:44 +00003052 if (cpipe->next == NULL) {
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003053 syntax("malformed for");
Denis Vlasenko87a86552008-07-29 19:43:10 +00003054 debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00003055 return 1;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00003056 }
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003057 /* "FOR v; do ..." and "for v IN a b; do..." are ok */
Denis Vlasenkocf22c892008-07-28 15:17:44 +00003058 if (cpipe->next->res_word == RES_DO)
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003059 continue;
3060 /* next word is not "do". It must be "in" then ("FOR v in ...") */
Denis Vlasenkocf22c892008-07-28 15:17:44 +00003061 if (cpipe->res_word == RES_IN /* "for v IN a b; not_do..."? */
3062 || cpipe->next->res_word != RES_IN /* FOR v not_do_and_not_in..."? */
Denis Vlasenko0c886c62007-01-30 22:30:09 +00003063 ) {
Denis Vlasenkoff182a32008-07-05 20:29:59 +00003064 syntax("malformed for");
Denis Vlasenko87a86552008-07-29 19:43:10 +00003065 debug_printf_exec("run_list lvl %d return 1\n", G.run_list_level);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00003066 return 1;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003067 }
3068 }
Denis Vlasenko06810332007-05-21 23:30:54 +00003069#endif
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00003070
Denis Vlasenkobe709c22008-07-28 00:01:16 +00003071 /* Past this point, all code paths should jump to ret: label
Denis Vlasenko12acec52008-07-28 15:15:59 +00003072 * in order to return, no direct "return" statements please.
3073 * This helps to ensure that no memory is leaked. */
Denis Vlasenkobe709c22008-07-28 00:01:16 +00003074
Denis Vlasenkoabedaac2009-03-31 12:03:40 +00003075////TODO: ctrl-Z handling needs re-thinking and re-testing
Denis Vlasenkod5762932009-03-31 11:22:57 +00003076
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00003077#if ENABLE_HUSH_JOB
3078 /* Example of nested list: "while true; do { sleep 1 | exit 2; } done".
3079 * We are saving state before entering outermost list ("while...done")
3080 * so that ctrl-Z will correctly background _entire_ outermost list,
3081 * not just a part of it (like "sleep 1 | exit 2") */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00003082 if (++G.run_list_level == 1 && G_interactive_fd) {
Denis Vlasenko87a86552008-07-29 19:43:10 +00003083 if (sigsetjmp(G.toplevel_jb, 1)) {
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00003084 /* ctrl-Z forked and we are parent; or ctrl-C.
3085 * Sighandler has longjmped us here */
3086 signal(SIGINT, SIG_IGN);
3087 signal(SIGTSTP, SIG_IGN);
3088 /* Restore level (we can be coming from deep inside
3089 * nested levels) */
Denis Vlasenko87a86552008-07-29 19:43:10 +00003090 G.run_list_level = 1;
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00003091#if ENABLE_FEATURE_SH_STANDALONE
Denis Vlasenko87a86552008-07-29 19:43:10 +00003092 if (G.nofork_save.saved) { /* if save area is valid */
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00003093 debug_printf_jobs("exiting nofork early\n");
Denis Vlasenko87a86552008-07-29 19:43:10 +00003094 restore_nofork_data(&G.nofork_save);
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00003095 }
3096#endif
Denis Vlasenkod5762932009-03-31 11:22:57 +00003097//// if (G.ctrl_z_flag) {
3098//// /* ctrl-Z has forked and stored pid of the child in pi->pid.
3099//// * Remember this child as background job */
3100//// insert_bg_job(pi);
3101//// } else {
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00003102 /* ctrl-C. We just stop doing whatever we were doing */
Denis Vlasenko4daad902007-09-27 10:20:47 +00003103 bb_putchar('\n');
Denis Vlasenkod5762932009-03-31 11:22:57 +00003104//// }
Denis Vlasenkoff29b4f2008-07-29 13:57:59 +00003105 USE_HUSH_LOOPS(loop_top = NULL;)
Denis Vlasenko87a86552008-07-29 19:43:10 +00003106 USE_HUSH_LOOPS(G.depth_of_loop = 0;)
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00003107 rcode = 0;
3108 goto ret;
3109 }
Denis Vlasenkod5762932009-03-31 11:22:57 +00003110//// /* ctrl-Z handler will store pid etc in pi */
3111//// G.toplevel_list = pi;
3112//// G.ctrl_z_flag = 0;
3113////#if ENABLE_FEATURE_SH_STANDALONE
3114//// G.nofork_save.saved = 0; /* in case we will run a nofork later */
3115////#endif
3116//// signal_SA_RESTART_empty_mask(SIGTSTP, handler_ctrl_z);
3117//// signal(SIGINT, handler_ctrl_c);
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00003118 }
Denis Vlasenko05743d72008-02-10 12:10:08 +00003119#endif /* JOB */
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00003120
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003121 rcode = G.last_return_code;
3122 rword = RES_NONE;
3123 last_rword = RES_XXXX;
3124 last_followup = PIPE_SEQ;
3125
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003126 /* Go through list of pipes, (maybe) executing them. */
3127 for (; pi; pi = USE_HUSH_LOOPS(rword == RES_DONE ? loop_top : ) pi->next) {
Denis Vlasenko422cd7c2009-03-31 12:41:52 +00003128 if (G.flag_SIGINT)
3129 break;
3130
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003131 IF_HAS_KEYWORDS(rword = pi->res_word;)
3132 IF_HAS_NO_KEYWORDS(rword = RES_NONE;)
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003133 debug_printf_exec(": rword=%d cond_code=%d last_rword=%d\n",
3134 rword, cond_code, last_rword);
Denis Vlasenko06810332007-05-21 23:30:54 +00003135#if ENABLE_HUSH_LOOPS
Denis Vlasenko4554b722008-07-29 13:36:09 +00003136 if ((rword == RES_WHILE || rword == RES_UNTIL || rword == RES_FOR)
Denis Vlasenko87a86552008-07-29 19:43:10 +00003137 && loop_top == NULL /* avoid bumping G.depth_of_loop twice */
Denis Vlasenko4554b722008-07-29 13:36:09 +00003138 ) {
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003139 /* start of a loop: remember where loop starts */
3140 loop_top = pi;
Denis Vlasenko87a86552008-07-29 19:43:10 +00003141 G.depth_of_loop++;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003142 }
Denis Vlasenko06810332007-05-21 23:30:54 +00003143#endif
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003144 /* Still in the same "if...", "then..." or "do..." branch? */
3145 if (rword == last_rword) {
3146 if ((rcode == 0 && last_followup == PIPE_OR)
3147 || (rcode != 0 && last_followup == PIPE_AND)
3148 ) {
3149 /* It is "<true> || CMD" or "<false> && CMD"
3150 * and we should not execute CMD */
3151 debug_printf_exec("skipped cmd because of || or &&\n");
3152 last_followup = pi->followup;
3153 continue;
3154 }
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003155 }
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003156 last_followup = pi->followup;
3157 last_rword = rword;
Denis Vlasenko06810332007-05-21 23:30:54 +00003158#if ENABLE_HUSH_IF
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003159 if (cond_code) {
3160 if (rword == RES_THEN) {
3161 /* "if <false> THEN cmd": skip cmd */
3162 continue;
3163 }
3164 } else {
3165 if (rword == RES_ELSE || rword == RES_ELIF) {
3166 /* "if <true> then ... ELSE/ELIF cmd":
3167 * skip cmd and all following ones */
3168 break;
3169 }
3170 }
Denis Vlasenko06810332007-05-21 23:30:54 +00003171#endif
3172#if ENABLE_HUSH_LOOPS
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003173 if (rword == RES_FOR) { /* && pi->num_cmds - always == 1 */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00003174 if (!for_lcur) {
Denis Vlasenkod65ea392007-10-01 10:02:25 +00003175 /* first loop through for */
Denis Vlasenkoff182a32008-07-05 20:29:59 +00003176
3177 static const char encoded_dollar_at[] ALIGN1 = {
3178 SPECIAL_VAR_SYMBOL, '@' | 0x80, SPECIAL_VAR_SYMBOL, '\0'
3179 }; /* encoded representation of "$@" */
3180 static const char *const encoded_dollar_at_argv[] = {
3181 encoded_dollar_at, NULL
3182 }; /* argv list with one element: "$@" */
3183 char **vals;
3184
3185 vals = (char**)encoded_dollar_at_argv;
Denis Vlasenkocf22c892008-07-28 15:17:44 +00003186 if (pi->next->res_word == RES_IN) {
Denis Vlasenkoff182a32008-07-05 20:29:59 +00003187 /* if no variable values after "in" we skip "for" */
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003188 if (!pi->next->cmds[0].argv) {
3189 G.last_return_code = rcode = EXIT_SUCCESS;
3190 debug_printf_exec(": null FOR: exitcode EXIT_SUCCESS\n");
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003191 break;
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003192 }
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003193 vals = pi->next->cmds[0].argv;
Denis Vlasenkoff182a32008-07-05 20:29:59 +00003194 } /* else: "for var; do..." -> assume "$@" list */
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003195 /* create list of variable values */
Denis Vlasenkoff182a32008-07-05 20:29:59 +00003196 debug_print_strings("for_list made from", vals);
3197 for_list = expand_strvec_to_strvec(vals);
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00003198 for_lcur = for_list;
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003199 debug_print_strings("for_list", for_list);
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003200 for_varname = pi->cmds[0].argv[0];
3201 pi->cmds[0].argv[0] = NULL;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00003202 }
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003203 free(pi->cmds[0].argv[0]);
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00003204 if (!*for_lcur) {
Denis Vlasenko12acec52008-07-28 15:15:59 +00003205 /* "for" loop is over, clean up */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00003206 free(for_list);
Denis Vlasenkobe709c22008-07-28 00:01:16 +00003207 for_list = NULL;
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00003208 for_lcur = NULL;
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003209 pi->cmds[0].argv[0] = for_varname;
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003210 break;
Eric Andersen4c9b68f2002-04-13 12:33:41 +00003211 }
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003212 /* Insert next value from for_lcur */
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003213//TODO: does it need escaping?
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003214 pi->cmds[0].argv[0] = xasprintf("%s=%s", for_varname, *for_lcur++);
3215 pi->cmds[0].assignment_cnt = 1;
Eric Andersenc7bda1c2004-03-15 08:29:22 +00003216 }
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00003217 if (rword == RES_IN) {
3218 continue; /* "for v IN list;..." - "in" has no cmds anyway */
3219 }
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003220 if (rword == RES_DONE) {
3221 continue; /* "done" has no cmds too */
Eric Andersenc7bda1c2004-03-15 08:29:22 +00003222 }
Denis Vlasenko06810332007-05-21 23:30:54 +00003223#endif
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003224#if ENABLE_HUSH_CASE
3225 if (rword == RES_CASE) {
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003226 case_word = expand_strvec_to_string(pi->cmds->argv);
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003227 continue;
3228 }
3229 if (rword == RES_MATCH) {
Denis Vlasenkofbeeb322008-07-31 00:17:01 +00003230 char **argv;
3231
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003232 if (!case_word) /* "case ... matched_word) ... WORD)": we executed selected branch, stop */
3233 break;
3234 /* all prev words didn't match, does this one match? */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003235 argv = pi->cmds->argv;
Denis Vlasenkofbeeb322008-07-31 00:17:01 +00003236 while (*argv) {
3237 char *pattern = expand_string_to_string(*argv);
3238 /* TODO: which FNM_xxx flags to use? */
3239 cond_code = (fnmatch(pattern, case_word, /*flags:*/ 0) != 0);
3240 free(pattern);
3241 if (cond_code == 0) { /* match! we will execute this branch */
3242 free(case_word); /* make future "word)" stop */
3243 case_word = NULL;
3244 break;
3245 }
3246 argv++;
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003247 }
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003248 continue;
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003249 }
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003250 if (rword == RES_CASEI) { /* inside of a case branch */
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003251 if (cond_code != 0)
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003252 continue; /* not matched yet, skip this pipe */
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003253 }
3254#endif
Denis Vlasenkod5762932009-03-31 11:22:57 +00003255 /* Just pressing <enter> in shell should check for jobs.
3256 * OTOH, in non-interactive shell this is useless
3257 * and only leads to extra job checks */
3258 if (pi->num_cmds == 0) {
Denis Vlasenko60b392f2009-04-03 19:14:32 +00003259 if (G_interactive_fd)
Denis Vlasenkod5762932009-03-31 11:22:57 +00003260 goto check_jobs_and_continue;
3261 continue;
3262 }
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003263
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003264 /* After analyzing all keywords and conditions, we decided
Denis Vlasenkod5762932009-03-31 11:22:57 +00003265 * to execute this pipe. NB: have to do checkjobs(NULL)
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003266 * after run_pipe to collect any background children,
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003267 * even if list execution is to be stopped. */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003268 debug_printf_exec(": run_pipe with %d members\n", pi->num_cmds);
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003269 {
3270 int r;
Denis Vlasenkodadfb492008-07-29 10:16:05 +00003271#if ENABLE_HUSH_LOOPS
Denis Vlasenko87a86552008-07-29 19:43:10 +00003272 G.flag_break_continue = 0;
Denis Vlasenkodadfb492008-07-29 10:16:05 +00003273#endif
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003274 rcode = r = run_pipe(pi); /* NB: rcode is a smallint */
3275 if (r != -1) {
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003276 /* We only ran a builtin: rcode is already known
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003277 * and we don't need to wait for anything. */
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003278 G.last_return_code = rcode;
3279 debug_printf_exec(": builtin exitcode %d\n", rcode);
Denis Vlasenko7566bae2009-03-31 17:24:49 +00003280 check_and_run_traps(0);
Denis Vlasenkodadfb492008-07-29 10:16:05 +00003281#if ENABLE_HUSH_LOOPS
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003282 /* Was it "break" or "continue"? */
Denis Vlasenko87a86552008-07-29 19:43:10 +00003283 if (G.flag_break_continue) {
3284 smallint fbc = G.flag_break_continue;
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003285 /* We might fall into outer *loop*,
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003286 * don't want to break it too */
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003287 if (loop_top) {
Denis Vlasenko87a86552008-07-29 19:43:10 +00003288 G.depth_break_continue--;
3289 if (G.depth_break_continue == 0)
3290 G.flag_break_continue = 0;
Denis Vlasenkofcf37c32008-07-29 11:37:15 +00003291 /* else: e.g. "continue 2" should *break* once, *then* continue */
3292 } /* else: "while... do... { we are here (innermost list is not a loop!) };...done" */
Denis Vlasenko87a86552008-07-29 19:43:10 +00003293 if (G.depth_break_continue != 0 || fbc == BC_BREAK)
Denis Vlasenkofcf37c32008-07-29 11:37:15 +00003294 goto check_jobs_and_break;
3295 /* "continue": simulate end of loop */
3296 rword = RES_DONE;
3297 continue;
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003298 }
Denis Vlasenkodadfb492008-07-29 10:16:05 +00003299#endif
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003300 } else if (pi->followup == PIPE_BG) {
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003301 /* What does bash do with attempts to background builtins? */
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003302 /* even bash 3.2 doesn't do that well with nested bg:
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003303 * try "{ { sleep 10; echo DEEP; } & echo HERE; } &".
3304 * I'm NOT treating inner &'s as jobs */
Denis Vlasenko7566bae2009-03-31 17:24:49 +00003305 check_and_run_traps(0);
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00003306#if ENABLE_HUSH_JOB
Denis Vlasenko87a86552008-07-29 19:43:10 +00003307 if (G.run_list_level == 1)
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003308 insert_bg_job(pi);
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00003309#endif
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003310 G.last_return_code = rcode = EXIT_SUCCESS;
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003311 debug_printf_exec(": cmd&: exitcode EXIT_SUCCESS\n");
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003312 } else {
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00003313#if ENABLE_HUSH_JOB
Denis Vlasenko60b392f2009-04-03 19:14:32 +00003314 if (G.run_list_level == 1 && G_interactive_fd) {
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003315 /* Waits for completion, then fg's main shell */
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003316 rcode = checkjobs_and_fg_shell(pi);
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003317 debug_printf_exec(": checkjobs_and_fg_shell exitcode %d\n", rcode);
Denis Vlasenko7566bae2009-03-31 17:24:49 +00003318 check_and_run_traps(0);
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003319 } else
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00003320#endif
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003321 { /* This one just waits for completion */
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003322 rcode = checkjobs(pi);
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003323 debug_printf_exec(": checkjobs exitcode %d\n", rcode);
Denis Vlasenko7566bae2009-03-31 17:24:49 +00003324 check_and_run_traps(0);
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003325 }
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003326 G.last_return_code = rcode;
Eric Andersen25f27032001-04-26 23:22:31 +00003327 }
3328 }
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003329
3330 /* Analyze how result affects subsequent commands */
Denis Vlasenko06810332007-05-21 23:30:54 +00003331#if ENABLE_HUSH_IF
Denis Vlasenko219e88d2007-05-21 10:18:23 +00003332 if (rword == RES_IF || rword == RES_ELIF)
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003333 cond_code = rcode;
Denis Vlasenko06810332007-05-21 23:30:54 +00003334#endif
3335#if ENABLE_HUSH_LOOPS
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003336 /* Beware of "while false; true; do ..."! */
3337 if (pi->next && pi->next->res_word == RES_DO) {
3338 if (rword == RES_WHILE) {
3339 if (rcode) {
3340 /* "while false; do...done" - exitcode 0 */
3341 G.last_return_code = rcode = EXIT_SUCCESS;
3342 debug_printf_exec(": while expr is false: breaking (exitcode:EXIT_SUCCESS)\n");
3343 goto check_jobs_and_break;
3344 }
Denis Vlasenko918a34b2008-07-28 23:17:31 +00003345 }
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003346 if (rword == RES_UNTIL) {
3347 if (!rcode) {
3348 debug_printf_exec(": until expr is true: breaking\n");
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003349 check_jobs_and_break:
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003350 checkjobs(NULL);
3351 break;
3352 }
Denis Vlasenkobcb25532008-07-28 23:04:34 +00003353 }
Denis Vlasenko5e052ca2008-07-28 15:15:09 +00003354 }
Denis Vlasenko06810332007-05-21 23:30:54 +00003355#endif
Mike Frysinger8ec1c9d2009-03-29 00:45:26 +00003356
3357 check_jobs_and_continue:
Eric Andersen028b65b2001-06-28 01:10:11 +00003358 checkjobs(NULL);
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003359 } /* for (pi) */
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00003360
3361#if ENABLE_HUSH_JOB
Denis Vlasenkod5762932009-03-31 11:22:57 +00003362//// if (G.ctrl_z_flag) {
3363//// /* ctrl-Z forked somewhere in the past, we are the child,
3364//// * and now we completed running the list. Exit. */
3365//////TODO: _exit?
3366//// exit(rcode);
3367//// }
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00003368 ret:
Denis Vlasenkod5762932009-03-31 11:22:57 +00003369 G.run_list_level--;
Denis Vlasenko60b392f2009-04-03 19:14:32 +00003370//// if (!G.run_list_level && G_interactive_fd) {
Denis Vlasenkod5762932009-03-31 11:22:57 +00003371//// signal(SIGTSTP, SIG_IGN);
3372//// signal(SIGINT, SIG_IGN);
3373//// }
Denis Vlasenkoac0e5ab2007-05-04 21:37:27 +00003374#endif
Denis Vlasenko87a86552008-07-29 19:43:10 +00003375 debug_printf_exec("run_list lvl %d return %d\n", G.run_list_level + 1, rcode);
Denis Vlasenkobe709c22008-07-28 00:01:16 +00003376#if ENABLE_HUSH_LOOPS
Denis Vlasenkofcf37c32008-07-29 11:37:15 +00003377 if (loop_top)
Denis Vlasenko87a86552008-07-29 19:43:10 +00003378 G.depth_of_loop--;
Denis Vlasenkobe709c22008-07-28 00:01:16 +00003379 free(for_list);
3380#endif
3381#if ENABLE_HUSH_CASE
3382 free(case_word);
3383#endif
Eric Andersen25f27032001-04-26 23:22:31 +00003384 return rcode;
3385}
3386
Eric Andersen25f27032001-04-26 23:22:31 +00003387/* Select which version we will use */
Denis Vlasenko05743d72008-02-10 12:10:08 +00003388static int run_and_free_list(struct pipe *pi)
Eric Andersen25f27032001-04-26 23:22:31 +00003389{
Denis Vlasenko0c886c62007-01-30 22:30:09 +00003390 int rcode = 0;
Denis Vlasenko05743d72008-02-10 12:10:08 +00003391 debug_printf_exec("run_and_free_list entered\n");
Denis Vlasenko87a86552008-07-29 19:43:10 +00003392 if (!G.fake_mode) {
Denis Vlasenkoa2b11e32009-04-06 14:11:13 +00003393 debug_printf_exec(": run_list: 1st pipe with %d cmds\n", pi->num_cmds);
Denis Vlasenko05743d72008-02-10 12:10:08 +00003394 rcode = run_list(pi);
Eric Andersenc7bda1c2004-03-15 08:29:22 +00003395 }
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00003396 /* free_pipe_list has the side effect of clearing memory.
Denis Vlasenko05743d72008-02-10 12:10:08 +00003397 * In the long run that function can be merged with run_list,
Eric Andersen25f27032001-04-26 23:22:31 +00003398 * but doing that now would hobble the debugging effort. */
Denis Vlasenko05743d72008-02-10 12:10:08 +00003399 free_pipe_list(pi, /* indent: */ 0);
Denis Vlasenko87f40ba2008-06-10 22:39:37 +00003400 debug_printf_exec("run_and_free_list return %d\n", rcode);
Eric Andersen25f27032001-04-26 23:22:31 +00003401 return rcode;
3402}
3403
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00003404
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003405/* Peek ahead in the in_str to find out if we have a "&n" construct,
3406 * as in "2>&1", that represents duplicating a file descriptor.
3407 * Return either -2 (syntax error), -1 (no &), or the number found.
3408 */
3409static int redirect_dup_num(struct in_str *input)
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00003410{
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003411 int ch, d = 0, ok = 0;
3412 ch = i_peek(input);
3413 if (ch != '&') return -1;
3414
3415 i_getch(input); /* get the & */
3416 ch = i_peek(input);
3417 if (ch == '-') {
3418 i_getch(input);
3419 return -3; /* "-" represents "close me" */
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00003420 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003421 while (isdigit(ch)) {
3422 d = d*10 + (ch-'0');
3423 ok = 1;
3424 i_getch(input);
3425 ch = i_peek(input);
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00003426 }
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003427 if (ok) return d;
Denis Vlasenko03eb8bf2007-05-14 16:19:34 +00003428
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003429 bb_error_msg("ambiguous redirect");
3430 return -2;
Eric Andersen78a7c992001-05-15 16:30:25 +00003431}
3432
Denis Vlasenkoff182a32008-07-05 20:29:59 +00003433/* The src parameter allows us to peek forward to a possible &n syntax
Eric Andersen25f27032001-04-26 23:22:31 +00003434 * for file descriptor duplication, e.g., "2>&1".
3435 * Return code is 0 normally, 1 if a syntax error is detected in src.
3436 * Resource errors (in xmalloc) cause the process to exit */
Denis Vlasenkof9f74292009-04-03 00:07:05 +00003437static int setup_redirect(struct parse_context *ctx,
3438 int fd,
3439 redir_type style,
3440 struct in_str *input)
Eric Andersen25f27032001-04-26 23:22:31 +00003441{
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003442 struct command *command = ctx->command;
Denis Vlasenkof9f74292009-04-03 00:07:05 +00003443 struct redir_struct *redir;
3444 struct redir_struct **redirp;
3445 int dup_num;
3446
3447 /* Check for a '2>&1' type redirect */
3448 dup_num = redirect_dup_num(input);
3449 if (dup_num == -2)
3450 return 1; /* syntax error */
Eric Andersen25f27032001-04-26 23:22:31 +00003451
3452 /* Create a new redir_struct and drop it onto the end of the linked list */
Denis Vlasenkof9f74292009-04-03 00:07:05 +00003453 redirp = &command->redirects;
3454 while ((redir = *redirp) != NULL) {
3455 redirp = &(redir->next);
Eric Andersen25f27032001-04-26 23:22:31 +00003456 }
Denis Vlasenkof9f74292009-04-03 00:07:05 +00003457 *redirp = redir = xzalloc(sizeof(*redir));
Denis Vlasenkoff097622007-10-01 10:00:45 +00003458 /* redir->next = NULL; */
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00003459 /* redir->rd_filename = NULL; */
Denis Vlasenko55789c62008-06-18 16:30:42 +00003460 redir->rd_type = style;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00003461 redir->fd = (fd == -1) ? redir_table[style].default_fd : fd;
Eric Andersen25f27032001-04-26 23:22:31 +00003462
3463 debug_printf("Redirect type %d%s\n", redir->fd, redir_table[style].descrip);
3464
Denis Vlasenkof9f74292009-04-03 00:07:05 +00003465 redir->dup = dup_num;
3466 if (dup_num != -1) {
Eric Andersen25f27032001-04-26 23:22:31 +00003467 /* Erik had a check here that the file descriptor in question
Eric Andersen83a2ae22001-05-07 17:59:25 +00003468 * is legit; I postpone that to "run time"
3469 * A "-" representation of "close me" shows up as a -3 here */
Eric Andersen25f27032001-04-26 23:22:31 +00003470 debug_printf("Duplicating redirect '%d>&%d'\n", redir->fd, redir->dup);
3471 } else {
3472 /* We do _not_ try to open the file that src points to,
3473 * since we need to return and let src be expanded first.
3474 * Set ctx->pending_redirect, so we know what to do at the
Denis Vlasenko201c72a2007-05-25 10:00:36 +00003475 * end of the next parsed word. */
Eric Andersen25f27032001-04-26 23:22:31 +00003476 ctx->pending_redirect = redir;
3477 }
3478 return 0;
3479}
3480
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003481
Denis Vlasenkoac678ec2007-04-16 22:32:04 +00003482static struct pipe *new_pipe(void)
3483{
Eric Andersen25f27032001-04-26 23:22:31 +00003484 struct pipe *pi;
Denis Vlasenko3ac0e002007-04-28 16:45:22 +00003485 pi = xzalloc(sizeof(struct pipe));
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003486 /*pi->followup = 0; - deliberately invalid value */
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003487 /*pi->res_word = RES_NONE; - RES_NONE is 0 anyway */
Eric Andersen25f27032001-04-26 23:22:31 +00003488 return pi;
3489}
3490
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003491/* Command (member of a pipe) is complete. The only possible error here
3492 * is out of memory, in which case xmalloc exits. */
3493static int done_command(struct parse_context *ctx)
3494{
3495 /* The command is really already in the pipe structure, so
3496 * advance the pipe counter and make a new, null command. */
3497 struct pipe *pi = ctx->pipe;
3498 struct command *command = ctx->command;
3499
3500 if (command) {
3501 if (command->group == NULL
3502 && command->argv == NULL
3503 && command->redirects == NULL
3504 ) {
3505 debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds);
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003506 memset(command, 0, sizeof(*command)); /* paranoia */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003507 return pi->num_cmds;
3508 }
3509 pi->num_cmds++;
3510 debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds);
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003511 //debug_print_tree(ctx->list_head, 20);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003512 } else {
3513 debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds);
3514 }
3515
3516 /* Only real trickiness here is that the uncommitted
3517 * command structure is not counted in pi->num_cmds. */
3518 pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1));
3519 command = &pi->cmds[pi->num_cmds];
3520 memset(command, 0, sizeof(*command));
3521
3522 ctx->command = command;
3523 /* but ctx->pipe and ctx->list_head remain unchanged */
3524
3525 return pi->num_cmds; /* used only for 0/nonzero check */
3526}
3527
3528static void done_pipe(struct parse_context *ctx, pipe_style type)
3529{
3530 int not_null;
3531
3532 debug_printf_parse("done_pipe entered, followup %d\n", type);
3533 /* Close previous command */
3534 not_null = done_command(ctx);
3535 ctx->pipe->followup = type;
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003536#if HAS_KEYWORDS
3537 ctx->pipe->pi_inverted = ctx->ctx_inverted;
3538 ctx->ctx_inverted = 0;
3539 ctx->pipe->res_word = ctx->ctx_res_w;
3540#endif
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003541
3542 /* Without this check, even just <enter> on command line generates
3543 * tree of three NOPs (!). Which is harmless but annoying.
3544 * IOW: it is safe to do it unconditionally.
3545 * RES_NONE case is for "for a in; do ..." (empty IN set)
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003546 * and other cases to work. */
3547 if (not_null
3548#if HAS_KEYWORDS
3549 || ctx->ctx_res_w == RES_FI
3550 || ctx->ctx_res_w == RES_DONE
3551 || ctx->ctx_res_w == RES_FOR
3552 || ctx->ctx_res_w == RES_IN
3553 || ctx->ctx_res_w == RES_ESAC
3554#endif
3555 ) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003556 struct pipe *new_p;
3557 debug_printf_parse("done_pipe: adding new pipe: "
3558 "not_null:%d ctx->ctx_res_w:%d\n",
3559 not_null, ctx->ctx_res_w);
3560 new_p = new_pipe();
3561 ctx->pipe->next = new_p;
3562 ctx->pipe = new_p;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003563 /* RES_THEN, RES_DO etc are "sticky" -
3564 * they remain set for commands inside if/while.
3565 * This is used to control execution.
3566 * RES_FOR and RES_IN are NOT sticky (needed to support
3567 * cases where variable or value happens to match a keyword):
3568 */
3569#if ENABLE_HUSH_LOOPS
3570 if (ctx->ctx_res_w == RES_FOR
3571 || ctx->ctx_res_w == RES_IN)
3572 ctx->ctx_res_w = RES_NONE;
3573#endif
3574#if ENABLE_HUSH_CASE
3575 if (ctx->ctx_res_w == RES_MATCH)
3576 ctx->ctx_res_w = RES_CASEI;
3577#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003578 ctx->command = NULL; /* trick done_command below */
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003579 /* Create the memory for command, roughly:
3580 * ctx->pipe->cmds = new struct command;
3581 * ctx->command = &ctx->pipe->cmds[0];
3582 */
3583 done_command(ctx);
Denis Vlasenkocd418a22009-04-06 18:08:35 +00003584 //debug_print_tree(ctx->list_head, 10);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003585 }
3586 debug_printf_parse("done_pipe return\n");
3587}
3588
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003589static void initialize_context(struct parse_context *ctx)
Eric Andersen25f27032001-04-26 23:22:31 +00003590{
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003591 memset(ctx, 0, sizeof(*ctx));
Denis Vlasenko1a735862007-05-23 00:32:25 +00003592 ctx->pipe = ctx->list_head = new_pipe();
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003593 /* Create the memory for command, roughly:
3594 * ctx->pipe->cmds = new struct command;
3595 * ctx->command = &ctx->pipe->cmds[0];
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003596 */
3597 done_command(ctx);
Eric Andersen25f27032001-04-26 23:22:31 +00003598}
3599
Denis Vlasenko424f79b2009-03-22 14:23:34 +00003600
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003601/* If a reserved word is found and processed, parse context is modified
3602 * and 1 is returned.
Eric Andersen25f27032001-04-26 23:22:31 +00003603 */
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003604#if HAS_KEYWORDS
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003605struct reserved_combo {
3606 char literal[6];
3607 unsigned char res;
3608 unsigned char assignment_flag;
3609 int flag;
3610};
3611enum {
3612 FLAG_END = (1 << RES_NONE ),
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003613#if ENABLE_HUSH_IF
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003614 FLAG_IF = (1 << RES_IF ),
3615 FLAG_THEN = (1 << RES_THEN ),
3616 FLAG_ELIF = (1 << RES_ELIF ),
3617 FLAG_ELSE = (1 << RES_ELSE ),
3618 FLAG_FI = (1 << RES_FI ),
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003619#endif
3620#if ENABLE_HUSH_LOOPS
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003621 FLAG_FOR = (1 << RES_FOR ),
3622 FLAG_WHILE = (1 << RES_WHILE),
3623 FLAG_UNTIL = (1 << RES_UNTIL),
3624 FLAG_DO = (1 << RES_DO ),
3625 FLAG_DONE = (1 << RES_DONE ),
3626 FLAG_IN = (1 << RES_IN ),
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003627#endif
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003628#if ENABLE_HUSH_CASE
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003629 FLAG_MATCH = (1 << RES_MATCH),
3630 FLAG_ESAC = (1 << RES_ESAC ),
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003631#endif
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003632 FLAG_START = (1 << RES_XXXX ),
3633};
3634
3635static const struct reserved_combo* match_reserved_word(o_string *word)
3636{
Eric Andersen25f27032001-04-26 23:22:31 +00003637 /* Mostly a list of accepted follow-up reserved words.
3638 * FLAG_END means we are done with the sequence, and are ready
3639 * to turn the compound list into a command.
3640 * FLAG_START means the word must start a new compound list.
3641 */
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00003642 static const struct reserved_combo reserved_list[] = {
Denis Vlasenko06810332007-05-21 23:30:54 +00003643#if ENABLE_HUSH_IF
Denis Vlasenko2b576b82008-08-04 00:46:07 +00003644 { "!", RES_NONE, NOT_ASSIGNMENT , 0 },
3645 { "if", RES_IF, WORD_IS_KEYWORD, FLAG_THEN | FLAG_START },
3646 { "then", RES_THEN, WORD_IS_KEYWORD, FLAG_ELIF | FLAG_ELSE | FLAG_FI },
3647 { "elif", RES_ELIF, WORD_IS_KEYWORD, FLAG_THEN },
3648 { "else", RES_ELSE, WORD_IS_KEYWORD, FLAG_FI },
3649 { "fi", RES_FI, NOT_ASSIGNMENT , FLAG_END },
Denis Vlasenko06810332007-05-21 23:30:54 +00003650#endif
3651#if ENABLE_HUSH_LOOPS
Denis Vlasenko2b576b82008-08-04 00:46:07 +00003652 { "for", RES_FOR, NOT_ASSIGNMENT , FLAG_IN | FLAG_DO | FLAG_START },
3653 { "while", RES_WHILE, WORD_IS_KEYWORD, FLAG_DO | FLAG_START },
3654 { "until", RES_UNTIL, WORD_IS_KEYWORD, FLAG_DO | FLAG_START },
3655 { "in", RES_IN, NOT_ASSIGNMENT , FLAG_DO },
3656 { "do", RES_DO, WORD_IS_KEYWORD, FLAG_DONE },
3657 { "done", RES_DONE, NOT_ASSIGNMENT , FLAG_END },
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003658#endif
3659#if ENABLE_HUSH_CASE
Denis Vlasenko2b576b82008-08-04 00:46:07 +00003660 { "case", RES_CASE, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_START },
3661 { "esac", RES_ESAC, NOT_ASSIGNMENT , FLAG_END },
Denis Vlasenko06810332007-05-21 23:30:54 +00003662#endif
Eric Andersen25f27032001-04-26 23:22:31 +00003663 };
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003664 const struct reserved_combo *r;
3665
3666 for (r = reserved_list; r < reserved_list + ARRAY_SIZE(reserved_list); r++) {
3667 if (strcmp(word->data, r->literal) == 0)
3668 return r;
3669 }
3670 return NULL;
3671}
3672static int reserved_word(o_string *word, struct parse_context *ctx)
3673{
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003674#if ENABLE_HUSH_CASE
3675 static const struct reserved_combo reserved_match = {
Denis Vlasenko2b576b82008-08-04 00:46:07 +00003676 "", RES_MATCH, NOT_ASSIGNMENT , FLAG_MATCH | FLAG_ESAC
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003677 };
3678#endif
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00003679 const struct reserved_combo *r;
Denis Vlasenkoc72c1ed2007-01-30 22:31:26 +00003680
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003681 r = match_reserved_word(word);
3682 if (!r)
3683 return 0;
3684
3685 debug_printf("found reserved word %s, res %d\n", r->literal, r->res);
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003686#if ENABLE_HUSH_CASE
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003687 if (r->res == RES_IN && ctx->ctx_res_w == RES_CASE)
3688 /* "case word IN ..." - IN part starts first match part */
3689 r = &reserved_match;
3690 else
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003691#endif
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003692 if (r->flag == 0) { /* '!' */
3693 if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003694 syntax("! ! command");
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003695 IF_HAS_KEYWORDS(ctx->ctx_res_w = RES_SNTX;)
Eric Andersen25f27032001-04-26 23:22:31 +00003696 }
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003697 ctx->ctx_inverted = 1;
Denis Vlasenko1a735862007-05-23 00:32:25 +00003698 return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00003699 }
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003700 if (r->flag & FLAG_START) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003701 struct parse_context *old;
3702 old = xmalloc(sizeof(*old));
3703 debug_printf_parse("push stack %p\n", old);
3704 *old = *ctx; /* physical copy */
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003705 initialize_context(ctx);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003706 ctx->stack = old;
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003707 } else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003708 syntax(word->data);
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003709 ctx->ctx_res_w = RES_SNTX;
3710 return 1;
3711 }
3712 ctx->ctx_res_w = r->res;
3713 ctx->old_flag = r->flag;
3714 if (ctx->old_flag & FLAG_END) {
3715 struct parse_context *old;
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003716 done_pipe(ctx, PIPE_SEQ);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003717 debug_printf_parse("pop stack %p\n", ctx->stack);
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003718 old = ctx->stack;
3719 old->command->group = ctx->list_head;
Denis Vlasenko371de4a2008-10-14 12:43:13 +00003720 old->command->grp_type = GRP_NORMAL;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00003721#if !BB_MMU
3722 o_addstr(&old->as_string, ctx->as_string.data);
3723 o_free_unsafe(&ctx->as_string);
3724 old->command->group_as_string = xstrdup(old->as_string.data);
3725 debug_printf_parse("pop, remembering as:'%s'\n",
3726 old->command->group_as_string);
3727#endif
Denis Vlasenkoc3735272008-10-09 12:58:26 +00003728 *ctx = *old; /* physical copy */
3729 free(old);
3730 }
3731 word->o_assignment = r->assignment_flag;
3732 return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00003733}
Denis Vlasenko06810332007-05-21 23:30:54 +00003734#endif
Eric Andersen25f27032001-04-26 23:22:31 +00003735
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003736/* Word is complete, look at it and update parsing context.
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003737 * Normal return is 0. Syntax errors return 1.
3738 * Note: on return, word is reset, but not o_free'd!
3739 */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003740static int done_word(o_string *word, struct parse_context *ctx)
Eric Andersen25f27032001-04-26 23:22:31 +00003741{
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003742 struct command *command = ctx->command;
Eric Andersen25f27032001-04-26 23:22:31 +00003743
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003744 debug_printf_parse("done_word entered: '%s' %p\n", word->data, command);
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00003745 if (word->length == 0 && word->nonnull == 0) {
3746 debug_printf_parse("done_word return 0: true null, ignored\n");
3747 return 0;
Eric Andersen25f27032001-04-26 23:22:31 +00003748 }
Denis Vlasenko2b576b82008-08-04 00:46:07 +00003749 /* If this word wasn't an assignment, next ones definitely
3750 * can't be assignments. Even if they look like ones. */
3751 if (word->o_assignment != DEFINITELY_ASSIGNMENT
3752 && word->o_assignment != WORD_IS_KEYWORD
3753 ) {
3754 word->o_assignment = NOT_ASSIGNMENT;
3755 } else {
3756 if (word->o_assignment == DEFINITELY_ASSIGNMENT)
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003757 command->assignment_cnt++;
Denis Vlasenko2b576b82008-08-04 00:46:07 +00003758 word->o_assignment = MAYBE_ASSIGNMENT;
3759 }
3760
Eric Andersen25f27032001-04-26 23:22:31 +00003761 if (ctx->pending_redirect) {
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00003762 /* We do not glob in e.g. >*.tmp case. bash seems to glob here
3763 * only if run as "bash", not "sh" */
3764 ctx->pending_redirect->rd_filename = xstrdup(word->data);
Denis Vlasenko55789c62008-06-18 16:30:42 +00003765 word->o_assignment = NOT_ASSIGNMENT;
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00003766 debug_printf("word stored in rd_filename: '%s'\n", word->data);
Eric Andersen25f27032001-04-26 23:22:31 +00003767 } else {
Denis Vlasenko395ae452008-07-14 06:29:38 +00003768 /* "{ echo foo; } echo bar" - bad */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003769 /* NB: bash allows e.g.:
3770 * if true; then { echo foo; } fi
3771 * while if false; then false; fi do break; done
3772 * TODO? */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003773 if (command->group) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003774 syntax(word->data);
3775 debug_printf_parse("done_word return 1: syntax error, "
3776 "groups and arglists don't mix\n");
Denis Vlasenko395ae452008-07-14 06:29:38 +00003777 return 1;
3778 }
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003779#if HAS_KEYWORDS
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003780#if ENABLE_HUSH_CASE
Denis Vlasenko757361f2008-07-14 08:26:47 +00003781 if (ctx->ctx_dsemicolon
3782 && strcmp(word->data, "esac") != 0 /* not "... pattern) cmd;; esac" */
3783 ) {
Denis Vlasenko395ae452008-07-14 06:29:38 +00003784 /* already done when ctx_dsemicolon was set to 1: */
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003785 /* ctx->ctx_res_w = RES_MATCH; */
3786 ctx->ctx_dsemicolon = 0;
3787 } else
3788#endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003789 if (!command->argv /* if it's the first word... */
Denis Vlasenko6bdff082008-07-09 20:14:53 +00003790#if ENABLE_HUSH_LOOPS
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003791 && ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */
3792 && ctx->ctx_res_w != RES_IN
Denis Vlasenko6bdff082008-07-09 20:14:53 +00003793#endif
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003794 ) {
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003795 debug_printf_parse(": checking '%s' for reserved-ness\n", word->data);
3796 if (reserved_word(word, ctx)) {
3797 o_reset(word);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00003798 debug_printf_parse("done_word return %d\n",
3799 (ctx->ctx_res_w == RES_SNTX));
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003800 return (ctx->ctx_res_w == RES_SNTX);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003801 }
Eric Andersen25f27032001-04-26 23:22:31 +00003802 }
Denis Vlasenko5ec61322008-06-24 00:50:07 +00003803#endif
Denis Vlasenkoff182a32008-07-05 20:29:59 +00003804 if (word->nonnull /* word had "xx" or 'xx' at least as part of it. */
Denis Vlasenko55789c62008-06-18 16:30:42 +00003805 /* optimization: and if it's ("" or '') or ($v... or `cmd`...): */
3806 && (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL)
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003807 /* (otherwise it's known to be not empty and is already safe) */
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00003808 ) {
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003809 /* exclude "$@" - it can expand to no word despite "" */
Denis Vlasenkoafdcd122008-07-05 17:40:04 +00003810 char *p = word->data;
3811 while (p[0] == SPECIAL_VAR_SYMBOL
3812 && (p[1] & 0x7f) == '@'
3813 && p[2] == SPECIAL_VAR_SYMBOL
3814 ) {
3815 p += 3;
3816 }
3817 if (p == word->data || p[0] != '\0') {
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003818 /* saw no "$@", or not only "$@" but some
3819 * real text is there too */
3820 /* insert "empty variable" reference, this makes
Denis Vlasenkoafdcd122008-07-05 17:40:04 +00003821 * e.g. "", $empty"" etc to not disappear */
3822 o_addchr(word, SPECIAL_VAR_SYMBOL);
3823 o_addchr(word, SPECIAL_VAR_SYMBOL);
3824 }
Denis Vlasenkoc1c63b62008-06-18 09:20:35 +00003825 }
Denis Vlasenko22d10a02008-10-13 08:53:43 +00003826 command->argv = add_string_to_strings(command->argv, xstrdup(word->data));
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003827 debug_print_strings("word appended to argv", command->argv);
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003828 }
Eric Andersen25f27032001-04-26 23:22:31 +00003829
Denis Vlasenkoa8442002008-06-14 11:00:17 +00003830 o_reset(word);
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00003831 ctx->pending_redirect = NULL;
3832
Denis Vlasenko06810332007-05-21 23:30:54 +00003833#if ENABLE_HUSH_LOOPS
Denis Vlasenkoab876cd2008-06-18 16:29:32 +00003834 /* Force FOR to have just one word (variable name) */
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003835 /* NB: basically, this makes hush see "for v in ..." syntax as if
3836 * as it is "for v; in ...". FOR and IN become two pipe structs
3837 * in parse tree. */
3838 if (ctx->ctx_res_w == RES_FOR) {
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003839//TODO: check that command->argv[0] is a valid variable name!
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00003840 done_pipe(ctx, PIPE_SEQ);
Denis Vlasenko733e3fb2008-07-06 10:01:13 +00003841 }
Denis Vlasenko06810332007-05-21 23:30:54 +00003842#endif
Denis Vlasenko17f02e72008-07-14 04:32:29 +00003843#if ENABLE_HUSH_CASE
3844 /* Force CASE to have just one word */
3845 if (ctx->ctx_res_w == RES_CASE) {
3846 done_pipe(ctx, PIPE_SEQ);
3847 }
3848#endif
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003849 debug_printf_parse("done_word return 0\n");
Eric Andersen25f27032001-04-26 23:22:31 +00003850 return 0;
3851}
3852
Eric Andersen25f27032001-04-26 23:22:31 +00003853/* If a redirect is immediately preceded by a number, that number is
3854 * supposed to tell which file descriptor to redirect. This routine
3855 * looks for such preceding numbers. In an ideal world this routine
3856 * needs to handle all the following classes of redirects...
3857 * echo 2>foo # redirects fd 2 to file "foo", nothing passed to echo
3858 * echo 49>foo # redirects fd 49 to file "foo", nothing passed to echo
3859 * echo -2>foo # redirects fd 1 to file "foo", "-2" passed to echo
3860 * echo 49x>foo # redirects fd 1 to file "foo", "49x" passed to echo
3861 * A -1 output from this program means no valid number was found, so the
3862 * caller should use the appropriate default for this redirection.
3863 */
3864static int redirect_opt_num(o_string *o)
3865{
3866 int num;
3867
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003868 if (o->length == 0)
3869 return -1;
3870 for (num = 0; num < o->length; num++) {
Denis Vlasenkoc1c63b62008-06-18 09:20:35 +00003871 if (!isdigit(o->data[num])) {
Eric Andersen25f27032001-04-26 23:22:31 +00003872 return -1;
3873 }
3874 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00003875 num = atoi(o->data);
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00003876 o_reset(o);
Eric Andersen25f27032001-04-26 23:22:31 +00003877 return num;
3878}
3879
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00003880#if BB_MMU
3881#define parse_stream(pstring, input, end_trigger) \
3882 parse_stream(input, end_trigger)
3883#endif
3884static struct pipe *parse_stream(char **pstring,
3885 struct in_str *input,
3886 int end_trigger);
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003887static void parse_and_run_string(const char *s);
Mike Frysingerddbee972009-03-22 22:48:41 +00003888
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00003889#if ENABLE_HUSH_TICK
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003890static FILE *generate_stream_from_string(const char *s)
Eric Andersen25f27032001-04-26 23:22:31 +00003891{
3892 FILE *pf;
Eric Andersen25f27032001-04-26 23:22:31 +00003893 int pid, channel[2];
Denis Vlasenkoba7cf262007-05-25 14:34:30 +00003894
Denis Vlasenko5a6aedd2007-05-26 16:44:20 +00003895 xpipe(channel);
Denis Vlasenko82604e92008-07-01 15:59:42 +00003896 pid = BB_MMU ? fork() : vfork();
3897 if (pid < 0)
3898 bb_perror_msg_and_die(BB_MMU ? "fork" : "vfork");
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003899
Denis Vlasenko05743d72008-02-10 12:10:08 +00003900 if (pid == 0) { /* child */
Denis Vlasenkof9375282009-04-05 19:13:39 +00003901#if ENABLE_HUSH_JOB
3902 die_sleep = 0; /* do not restore tty pgrp on xfunc death */
3903#endif
Denis Vlasenkoba7cf262007-05-25 14:34:30 +00003904 /* Process substitution is not considered to be usual
3905 * 'command execution'.
Denis Vlasenkoabedaac2009-03-31 12:03:40 +00003906 * SUSv3 says ctrl-Z should be ignored, ctrl-C should not.
3907 */
Denis Vlasenkoe0755e52009-04-03 21:16:45 +00003908 bb_signals(0
3909 + (1 << SIGTSTP)
3910 + (1 << SIGTTIN)
3911 + (1 << SIGTTOU)
3912 , SIG_IGN);
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003913 close(channel[0]); /* NB: close _first_, then move fd! */
3914 xmove_fd(channel[1], 1);
3915 /* Prevent it from trying to handle ctrl-z etc */
3916 USE_HUSH_JOB(G.run_list_level = 1;)
3917#if BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00003918 reset_traps_to_defaults();
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003919 parse_and_run_string(s);
3920 _exit(G.last_return_code);
3921#else
3922 /* We re-execute after vfork on NOMMU. This makes this script safe:
Denis Vlasenkof9375282009-04-05 19:13:39 +00003923 * yes "0123456789012345678901234567890" | dd bs=32 count=64k >BIG
3924 * huge=`cat BIG` # was blocking here forever
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003925 * echo OK
3926 */
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00003927 re_execute_shell(s);
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003928#endif
Eric Andersen25f27032001-04-26 23:22:31 +00003929 }
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003930
3931 /* parent */
Denis Vlasenkof9375282009-04-05 19:13:39 +00003932#if ENABLE_HUSH_JOB
3933 die_sleep = -1; /* restore tty pgrp on xfunc death */
3934#endif
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00003935 clean_up_after_re_execute();
Eric Andersen25f27032001-04-26 23:22:31 +00003936 close(channel[1]);
Denis Vlasenko5f786c22007-04-20 08:35:45 +00003937 pf = fdopen(channel[0], "r");
Eric Andersen25f27032001-04-26 23:22:31 +00003938 return pf;
3939}
3940
Denis Vlasenko21f0d4c2007-05-06 14:15:42 +00003941/* Return code is exit status of the process that is run. */
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003942static int process_command_subs(o_string *dest, const char *s)
Eric Andersen25f27032001-04-26 23:22:31 +00003943{
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003944 FILE *pf;
Eric Andersen25f27032001-04-26 23:22:31 +00003945 struct in_str pipe_str;
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003946 int ch, eol_cnt;
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00003947
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003948 pf = generate_stream_from_string(s);
3949 if (pf == NULL)
Denis Vlasenko05743d72008-02-10 12:10:08 +00003950 return 1;
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003951 close_on_exec_on(fileno(pf));
Eric Andersen25f27032001-04-26 23:22:31 +00003952
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00003953 /* Now send results of command back into original context */
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003954 setup_file_in_str(&pipe_str, pf);
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00003955 eol_cnt = 0;
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00003956 while ((ch = i_getch(&pipe_str)) != EOF) {
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00003957 if (ch == '\n') {
3958 eol_cnt++;
3959 continue;
3960 }
3961 while (eol_cnt) {
Denis Vlasenko55789c62008-06-18 16:30:42 +00003962 o_addchr(dest, '\n');
Denis Vlasenko3e9aaae2007-05-11 12:56:43 +00003963 eol_cnt--;
3964 }
Denis Vlasenko7e3d33b2008-06-12 13:31:04 +00003965 o_addQchr(dest, ch);
Eric Andersen25f27032001-04-26 23:22:31 +00003966 }
3967
3968 debug_printf("done reading from pipe, pclose()ing\n");
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00003969 /* Note: we got EOF, and we just close the read end of the pipe.
3970 * We do not wait for the `cmd` child to terminate. bash and ash do.
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003971 * Try these:
3972 * echo `echo Hi; exec 1>&-; sleep 2` - bash waits 2 sec
3973 * `false`; echo $? - bash outputs "1"
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00003974 */
Denis Vlasenkodb2a9b62009-04-03 22:31:18 +00003975 fclose(pf);
3976 debug_printf("closed FILE from child. return 0\n");
3977 return 0;
Eric Andersen25f27032001-04-26 23:22:31 +00003978}
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00003979#endif
Eric Andersen25f27032001-04-26 23:22:31 +00003980
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003981static int parse_group(o_string *dest, struct parse_context *ctx,
Eric Andersen25f27032001-04-26 23:22:31 +00003982 struct in_str *input, int ch)
3983{
Denis Vlasenko371de4a2008-10-14 12:43:13 +00003984 /* dest contains characters seen prior to ( or {.
Denis Vlasenko027e3fd2009-04-02 22:50:40 +00003985 * Typically it's empty, but for function defs,
Denis Vlasenko371de4a2008-10-14 12:43:13 +00003986 * it contains function name (without '()'). */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00003987 struct pipe *pipe_list;
Denis Vlasenko240c2552009-04-03 03:45:05 +00003988 int endch;
Denis Vlasenko9af22c72008-10-09 12:54:58 +00003989 struct command *command = ctx->command;
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00003990
3991 debug_printf_parse("parse_group entered\n");
Denis Vlasenko371de4a2008-10-14 12:43:13 +00003992#if ENABLE_HUSH_FUNCTIONS
3993 if (ch == 'F') { /* function definition? */
3994 bb_error_msg("aha '%s' is a function, parsing it...", dest->data);
3995 //command->fname = dest->data;
3996 command->grp_type = GRP_FUNCTION;
3997//TODO: review every o_reset() location... do they handle all o_string fields correctly?
3998 memset(dest, 0, sizeof(*dest));
3999 }
4000#endif
Denis Vlasenko9af22c72008-10-09 12:54:58 +00004001 if (command->argv /* word [word](... */
4002 || dest->length /* word(... */
4003 || dest->nonnull /* ""(... */
4004 ) {
Denis Vlasenko90e485c2007-05-23 15:22:50 +00004005 syntax(NULL);
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004006 debug_printf_parse("parse_group return 1: "
4007 "syntax error, groups and arglists don't mix\n");
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00004008 return 1;
Eric Andersen25f27032001-04-26 23:22:31 +00004009 }
Denis Vlasenko240c2552009-04-03 03:45:05 +00004010 endch = '}';
Denis Vlasenko90e485c2007-05-23 15:22:50 +00004011 if (ch == '(') {
Denis Vlasenko240c2552009-04-03 03:45:05 +00004012 endch = ')';
Denis Vlasenko371de4a2008-10-14 12:43:13 +00004013 command->grp_type = GRP_SUBSHELL;
Eric Andersen25f27032001-04-26 23:22:31 +00004014 }
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004015 {
4016#if !BB_MMU
4017 char *as_string = NULL;
4018#endif
4019 pipe_list = parse_stream(&as_string, input, endch);
4020#if !BB_MMU
4021 if (as_string)
4022 o_addstr(&ctx->as_string, as_string);
4023#endif
4024 /* empty ()/{} or parse error? */
4025 if (!pipe_list || pipe_list == ERR_PTR) {
4026#if !BB_MMU
4027 free(as_string);
4028#endif
4029 syntax(NULL);
4030 debug_printf_parse("parse_group return 1: "
4031 "parse_stream returned %p\n", pipe_list);
4032 return 1;
4033 }
4034 command->group = pipe_list;
4035#if !BB_MMU
4036 as_string[strlen(as_string) - 1] = '\0'; /* plink ')' or '}' */
4037 command->group_as_string = as_string;
4038 debug_printf_parse("end of group, remembering as:'%s'\n",
4039 command->group_as_string);
4040#endif
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00004041 }
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004042 debug_printf_parse("parse_group return 0\n");
4043 return 0;
Denis Vlasenko9af22c72008-10-09 12:54:58 +00004044 /* command remains "open", available for possible redirects */
Eric Andersen25f27032001-04-26 23:22:31 +00004045}
4046
Mike Frysinger98c52642009-04-02 10:02:37 +00004047#if ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004048/* Subroutines for copying $(...) and `...` things */
4049static void add_till_backquote(o_string *dest, struct in_str *input);
4050/* '...' */
4051static void add_till_single_quote(o_string *dest, struct in_str *input)
4052{
4053 while (1) {
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004054 int ch = i_getch(input);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004055 if (ch == EOF)
4056 break;
4057 if (ch == '\'')
4058 break;
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004059 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004060 }
4061}
4062/* "...\"...`..`...." - do we need to handle "...$(..)..." too? */
4063static void add_till_double_quote(o_string *dest, struct in_str *input)
4064{
4065 while (1) {
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004066 int ch = i_getch(input);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004067 if (ch == '"')
4068 break;
4069 if (ch == '\\') { /* \x. Copy both chars. */
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004070 o_addchr(dest, ch);
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004071 ch = i_getch(input);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004072 }
4073 if (ch == EOF)
4074 break;
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004075 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004076 if (ch == '`') {
4077 add_till_backquote(dest, input);
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004078 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004079 continue;
4080 }
Denis Vlasenko5703c222008-06-15 11:49:42 +00004081 //if (ch == '$') ...
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004082 }
4083}
4084/* Process `cmd` - copy contents until "`" is seen. Complicated by
4085 * \` quoting.
4086 * "Within the backquoted style of command substitution, backslash
4087 * shall retain its literal meaning, except when followed by: '$', '`', or '\'.
4088 * The search for the matching backquote shall be satisfied by the first
4089 * backquote found without a preceding backslash; during this search,
4090 * if a non-escaped backquote is encountered within a shell comment,
4091 * a here-document, an embedded command substitution of the $(command)
4092 * form, or a quoted string, undefined results occur. A single-quoted
4093 * or double-quoted string that begins, but does not end, within the
4094 * "`...`" sequence produces undefined results."
4095 * Example Output
4096 * echo `echo '\'TEST\`echo ZZ\`BEST` \TESTZZBEST
4097 */
4098static void add_till_backquote(o_string *dest, struct in_str *input)
4099{
4100 while (1) {
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004101 int ch = i_getch(input);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004102 if (ch == '`')
4103 break;
4104 if (ch == '\\') { /* \x. Copy both chars unless it is \` */
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004105 int ch2 = i_getch(input);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004106 if (ch2 != '`' && ch2 != '$' && ch2 != '\\')
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004107 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004108 ch = ch2;
4109 }
4110 if (ch == EOF)
4111 break;
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004112 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004113 }
4114}
4115/* Process $(cmd) - copy contents until ")" is seen. Complicated by
4116 * quoting and nested ()s.
4117 * "With the $(command) style of command substitution, all characters
4118 * following the open parenthesis to the matching closing parenthesis
4119 * constitute the command. Any valid shell script can be used for command,
4120 * except a script consisting solely of redirections which produces
4121 * unspecified results."
4122 * Example Output
4123 * echo $(echo '(TEST)' BEST) (TEST) BEST
4124 * echo $(echo 'TEST)' BEST) TEST) BEST
4125 * echo $(echo \(\(TEST\) BEST) ((TEST) BEST
4126 */
Mike Frysinger98c52642009-04-02 10:02:37 +00004127static void add_till_closing_paren(o_string *dest, struct in_str *input, bool dbl)
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004128{
4129 int count = 0;
4130 while (1) {
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004131 int ch = i_getch(input);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004132 if (ch == EOF)
4133 break;
4134 if (ch == '(')
4135 count++;
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004136 if (ch == ')') {
Mike Frysinger98c52642009-04-02 10:02:37 +00004137 if (--count < 0) {
4138 if (!dbl)
4139 break;
4140 if (i_peek(input) == ')') {
4141 i_getch(input);
4142 break;
4143 }
4144 }
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004145 }
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004146 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004147 if (ch == '\'') {
4148 add_till_single_quote(dest, input);
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004149 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004150 continue;
4151 }
4152 if (ch == '"') {
4153 add_till_double_quote(dest, input);
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004154 o_addchr(dest, ch);
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004155 continue;
4156 }
Denis Vlasenko76db5ad2008-06-12 12:58:20 +00004157 if (ch == '\\') { /* \x. Copy verbatim. Important for \(, \) */
4158 ch = i_getch(input);
4159 if (ch == EOF)
4160 break;
Denis Vlasenko82dfec32008-06-16 12:47:11 +00004161 o_addchr(dest, ch);
Denis Vlasenko76db5ad2008-06-12 12:58:20 +00004162 continue;
4163 }
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004164 }
4165}
Mike Frysinger98c52642009-04-02 10:02:37 +00004166#endif /* ENABLE_HUSH_TICK || ENABLE_SH_MATH_SUPPORT */
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004167
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00004168/* Return code: 0 for OK, 1 for syntax error */
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004169#if BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004170#define handle_dollar(as_string, dest, input) \
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004171 handle_dollar(dest, input)
4172#endif
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004173static int handle_dollar(o_string *as_string,
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004174 o_string *dest,
4175 struct in_str *input)
Eric Andersen25f27032001-04-26 23:22:31 +00004176{
Mike Frysinger6379bb42009-03-28 18:55:03 +00004177 int expansion;
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004178 int ch = i_peek(input); /* first character after the $ */
Denis Vlasenkob7aaae92009-04-02 20:17:49 +00004179 unsigned char quote_mask = dest->o_escape ? 0x80 : 0;
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00004180
4181 debug_printf_parse("handle_dollar entered: ch='%c'\n", ch);
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00004182 if (isalpha(ch)) {
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004183 ch = i_getch(input);
4184#if !BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004185 if (as_string) o_addchr(as_string, ch);
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004186#endif
Denis Vlasenkod4981312008-07-31 10:34:48 +00004187 make_var:
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004188 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00004189 while (1) {
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00004190 debug_printf_parse(": '%c'\n", ch);
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004191 o_addchr(dest, ch | quote_mask);
Denis Vlasenko1f4cf512007-05-16 10:39:24 +00004192 quote_mask = 0;
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004193 ch = i_peek(input);
Denis Vlasenko602d13c2007-05-13 18:34:53 +00004194 if (!isalnum(ch) && ch != '_')
4195 break;
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004196 ch = i_getch(input);
4197#if !BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004198 if (as_string) o_addchr(as_string, ch);
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004199#endif
Eric Andersen25f27032001-04-26 23:22:31 +00004200 }
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004201 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00004202 } else if (isdigit(ch)) {
Denis Vlasenko602d13c2007-05-13 18:34:53 +00004203 make_one_char_var:
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004204 ch = i_getch(input);
4205#if !BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004206 if (as_string) o_addchr(as_string, ch);
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004207#endif
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004208 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Denis Vlasenko602d13c2007-05-13 18:34:53 +00004209 debug_printf_parse(": '%c'\n", ch);
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004210 o_addchr(dest, ch | quote_mask);
4211 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00004212 } else switch (ch) {
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004213 case '$': /* pid */
4214 case '!': /* last bg pid */
4215 case '?': /* last exit code */
4216 case '#': /* number of args */
4217 case '*': /* args */
4218 case '@': /* args */
4219 goto make_one_char_var;
4220 case '{': {
4221 bool first_char, all_digits;
Mike Frysinger6379bb42009-03-28 18:55:03 +00004222
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004223 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004224 ch = i_getch(input);
4225#if !BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004226 if (as_string) o_addchr(as_string, ch);
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004227#endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004228 /* XXX maybe someone will try to escape the '}' */
4229 expansion = 0;
4230 first_char = true;
4231 all_digits = false;
4232 while (1) {
4233 ch = i_getch(input);
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004234#if !BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004235 if (as_string) o_addchr(as_string, ch);
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004236#endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004237 if (ch == '}')
Mike Frysinger98c52642009-04-02 10:02:37 +00004238 break;
Mike Frysinger98c52642009-04-02 10:02:37 +00004239
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004240 if (first_char) {
4241 if (ch == '#')
4242 /* ${#var}: length of var contents */
4243 goto char_ok;
4244 else if (isdigit(ch)) {
4245 all_digits = true;
4246 goto char_ok;
4247 }
4248 }
4249
4250 if (expansion < 2
4251 && ( (all_digits && !isdigit(ch))
4252 || (!all_digits && !isalnum(ch) && ch != '_')
4253 )
4254 ) {
4255 /* handle parameter expansions
4256 * http://www.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_02
4257 */
4258 if (first_char)
4259 goto case_default;
4260 switch (ch) {
4261 case ':': /* null modifier */
4262 if (expansion == 0) {
4263 debug_printf_parse(": null modifier\n");
4264 ++expansion;
4265 break;
4266 }
4267 goto case_default;
4268#if 0 /* not implemented yet :( */
4269 case '#': /* remove prefix */
4270 case '%': /* remove suffix */
4271 if (expansion == 0) {
4272 debug_printf_parse(": remove suffix/prefix\n");
4273 expansion = 2;
4274 break;
4275 }
4276 goto case_default;
Mike Frysinger98c52642009-04-02 10:02:37 +00004277#endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004278 case '-': /* default value */
4279 case '=': /* assign default */
4280 case '+': /* alternative */
4281 case '?': /* error indicate */
4282 debug_printf_parse(": parameter expansion\n");
4283 expansion = 2;
4284 break;
4285 default:
4286 case_default:
4287 syntax("unterminated ${name}");
4288 debug_printf_parse("handle_dollar return 1: unterminated ${name}\n");
4289 return 1;
4290 }
4291 }
4292 char_ok:
4293 debug_printf_parse(": '%c'\n", ch);
4294 o_addchr(dest, ch | quote_mask);
4295 quote_mask = 0;
4296 first_char = false;
4297 }
4298 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4299 break;
4300 }
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004301#if (ENABLE_SH_MATH_SUPPORT || ENABLE_HUSH_TICK)
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004302 case '(': {
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004303# if !BB_MMU
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00004304 int pos;
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004305# endif
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004306 ch = i_getch(input);
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004307# if !BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004308 if (as_string) o_addchr(as_string, ch);
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004309# endif
4310# if ENABLE_SH_MATH_SUPPORT
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004311 if (i_peek(input) == '(') {
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004312 ch = i_getch(input);
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004313# if !BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004314 if (as_string) o_addchr(as_string, ch);
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004315# endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004316 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4317 o_addchr(dest, /*quote_mask |*/ '+');
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004318# if !BB_MMU
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00004319 pos = dest->length;
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004320# endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004321 add_till_closing_paren(dest, input, true);
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004322# if !BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004323 if (as_string) {
4324 o_addstr(as_string, dest->data + pos);
4325 o_addchr(as_string, ')');
4326 o_addchr(as_string, ')');
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00004327 }
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004328# endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004329 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Eric Andersen25f27032001-04-26 23:22:31 +00004330 break;
Denis Vlasenko76db5ad2008-06-12 12:58:20 +00004331 }
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004332# endif
4333# if ENABLE_HUSH_TICK
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004334 //int pos = dest->length;
4335 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4336 o_addchr(dest, quote_mask | '`');
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004337# if !BB_MMU
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00004338 pos = dest->length;
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004339# endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004340 add_till_closing_paren(dest, input, false);
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004341# if !BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004342 if (as_string) {
4343 o_addstr(as_string, dest->data + pos);
4344 o_addchr(as_string, '`');
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00004345 }
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004346# endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004347 //debug_printf_subst("SUBST RES2 '%s'\n", dest->data + pos);
4348 o_addchr(dest, SPECIAL_VAR_SYMBOL);
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004349# endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004350 break;
4351 }
Denis Vlasenkod85a5df2009-04-05 08:43:57 +00004352#endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004353 case '_':
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004354 ch = i_getch(input);
4355#if !BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004356 if (as_string) o_addchr(as_string, ch);
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004357#endif
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004358 ch = i_peek(input);
4359 if (isalnum(ch)) { /* it's $_name or $_123 */
4360 ch = '_';
4361 goto make_var;
4362 }
4363 /* else: it's $_ */
4364 /* TODO: */
4365 /* $_ Shell or shell script name; or last cmd name */
4366 /* $- Option flags set by set builtin or shell options (-i etc) */
4367 default:
4368 o_addQchr(dest, '$');
Eric Andersen25f27032001-04-26 23:22:31 +00004369 }
Denis Vlasenkoe0a33672007-05-10 23:06:55 +00004370 debug_printf_parse("handle_dollar return 0\n");
Eric Andersen25f27032001-04-26 23:22:31 +00004371 return 0;
4372}
4373
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004374#if BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004375#define parse_stream_dquoted(as_string, dest, input, dquote_end) \
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004376 parse_stream_dquoted(dest, input, dquote_end)
4377#endif
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004378static int parse_stream_dquoted(o_string *as_string,
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004379 o_string *dest,
4380 struct in_str *input,
4381 int dquote_end)
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004382{
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004383 int ch;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004384 int next;
4385
4386 again:
4387 ch = i_getch(input);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004388#if !BB_MMU
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004389 if (as_string && ch != EOF)
4390 o_addchr(as_string, ch);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004391#endif
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004392 if (ch == dquote_end) { /* may be only '"' or EOF */
4393 dest->nonnull = 1;
4394 if (dest->o_assignment == NOT_ASSIGNMENT)
Denis Vlasenkob7aaae92009-04-02 20:17:49 +00004395 dest->o_escape ^= 1;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004396 debug_printf_parse("parse_stream_dquoted return 0\n");
4397 return 0;
4398 }
4399 if (ch == EOF) {
4400 syntax("unterminated \"");
4401 debug_printf_parse("parse_stream_dquoted return 1: unterminated \"\n");
4402 return 1;
4403 }
4404 next = '\0';
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004405 if (ch != '\n') {
4406 next = i_peek(input);
4407 }
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00004408 debug_printf_parse(": ch=%c (%d) escape=%d\n",
4409 ch, ch, dest->o_escape);
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004410 if (ch == '\\') {
4411 if (next == EOF) {
4412 syntax("\\<eof>");
4413 debug_printf_parse("parse_stream_dquoted return 1: \\<eof>\n");
4414 return 1;
4415 }
4416 /* bash:
4417 * "The backslash retains its special meaning [in "..."]
4418 * only when followed by one of the following characters:
4419 * $, `, ", \, or <newline>. A double quote may be quoted
4420 * within double quotes by preceding it with a backslash.
4421 * If enabled, history expansion will be performed unless
4422 * an ! appearing in double quotes is escaped using
4423 * a backslash. The backslash preceding the ! is not removed."
4424 */
4425 if (strchr("$`\"\\", next) != NULL) {
4426 o_addqchr(dest, i_getch(input));
4427 } else {
4428 o_addqchr(dest, '\\');
4429 }
4430 goto again;
4431 }
4432 if (ch == '$') {
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004433 if (handle_dollar(as_string, dest, input) != 0) {
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004434 debug_printf_parse("parse_stream_dquoted return 1: "
4435 "handle_dollar returned non-0\n");
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004436 return 1;
4437 }
4438 goto again;
4439 }
4440#if ENABLE_HUSH_TICK
4441 if (ch == '`') {
4442 //int pos = dest->length;
4443 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4444 o_addchr(dest, 0x80 | '`');
4445 add_till_backquote(dest, input);
4446 o_addchr(dest, SPECIAL_VAR_SYMBOL);
4447 //debug_printf_subst("SUBST RES3 '%s'\n", dest->data + pos);
Denis Vlasenkof328e002009-04-02 16:55:38 +00004448 goto again;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004449 }
4450#endif
Denis Vlasenkof328e002009-04-02 16:55:38 +00004451 o_addQchr(dest, ch);
4452 if (ch == '='
4453 && (dest->o_assignment == MAYBE_ASSIGNMENT
4454 || dest->o_assignment == WORD_IS_KEYWORD)
4455 && is_assignment(dest->data)
4456 ) {
4457 dest->o_assignment = DEFINITELY_ASSIGNMENT;
4458 }
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004459 goto again;
4460}
4461
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004462/*
4463 * Scan input until EOF or end_trigger char.
4464 * Return a list of pipes to execute, or NULL on EOF
4465 * or if end_trigger character is met.
4466 * On syntax error, exit is shell is not interactive,
4467 * reset parsing machinery and start parsing anew,
4468 * or return ERR_PTR.
Denis Vlasenko027e3fd2009-04-02 22:50:40 +00004469 */
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004470static struct pipe *parse_stream(char **pstring,
4471 struct in_str *input,
4472 int end_trigger)
Eric Andersen25f27032001-04-26 23:22:31 +00004473{
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004474 struct parse_context ctx;
4475 o_string dest = NULL_O_STRING;
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004476 int is_in_dquote;
Eric Andersen25f27032001-04-26 23:22:31 +00004477
Denis Vlasenkob7aaae92009-04-02 20:17:49 +00004478 /* Double-quote state is handled in the state variable is_in_dquote.
Eric Andersen25f27032001-04-26 23:22:31 +00004479 * A single-quote triggers a bypass of the main loop until its mate is
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004480 * found. When recursing, quote state is passed in via dest->o_escape.
4481 */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004482 debug_printf_parse("parse_stream entered, end_trigger='%c'\n",
4483 end_trigger ? : 'X');
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00004484
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004485 G.ifs = get_local_var_value("IFS");
4486 if (G.ifs == NULL)
4487 G.ifs = " \t\n";
4488
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004489 reset:
4490#if ENABLE_HUSH_INTERACTIVE
4491 input->promptmode = 0; /* PS1 */
4492#endif
4493 /* dest.o_assignment = MAYBE_ASSIGNMENT; - already is */
4494 initialize_context(&ctx);
4495 is_in_dquote = 0;
Denis Vlasenko1a735862007-05-23 00:32:25 +00004496 while (1) {
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004497 const char *is_ifs;
4498 const char *is_special;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004499 int ch;
4500 int next;
4501 int redir_fd;
4502 redir_type redir_style;
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004503
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004504 if (is_in_dquote) {
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004505 if (parse_stream_dquoted(&ctx.as_string, &dest, input, '"')) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004506 goto parse_error;
4507 }
4508 /* We reached closing '"' */
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004509 is_in_dquote = 0;
4510 }
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004511 ch = i_getch(input);
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004512 debug_printf_parse(": ch=%c (%d) escape=%d\n",
4513 ch, ch, dest.o_escape);
4514 if (ch == EOF) {
4515 struct pipe *pi;
4516 if (done_word(&dest, &ctx)) {
4517 goto parse_error;
Denis Vlasenko55789c62008-06-18 16:30:42 +00004518 }
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004519 o_free(&dest);
4520 done_pipe(&ctx, PIPE_SEQ);
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004521 pi = ctx.list_head;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004522 /* If we got nothing... */
4523// TODO: test script consisting of just "&"
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004524 if (pi->num_cmds == 0
4525 IF_HAS_KEYWORDS( && pi->res_word == RES_NONE)
4526 ) {
4527 free_pipe_list(pi, 0);
4528 pi = NULL;
4529 }
4530 debug_printf_parse("parse_stream return %p\n", pi);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004531#if !BB_MMU
4532 debug_printf_parse("as_string '%s'\n", ctx.as_string.data);
4533 if (pstring)
4534 *pstring = ctx.as_string.data;
4535 else
4536 o_free_unsafe(&ctx.as_string);
4537#endif
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004538 return pi;
Denis Vlasenko1a735862007-05-23 00:32:25 +00004539 }
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004540#if !BB_MMU
4541 o_addchr(&ctx.as_string, ch);
4542#endif
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004543 is_ifs = strchr(G.ifs, ch);
4544 is_special = strchr("<>;&|(){}#'" /* special outside of "str" */
4545 "\\$\"" USE_HUSH_TICK("`") /* always special */
4546 , ch);
4547
4548 if (!is_special && !is_ifs) { /* ordinary char */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004549 o_addQchr(&dest, ch);
4550 if ((dest.o_assignment == MAYBE_ASSIGNMENT
4551 || dest.o_assignment == WORD_IS_KEYWORD)
Denis Vlasenko55789c62008-06-18 16:30:42 +00004552 && ch == '='
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004553 && is_assignment(dest.data)
Denis Vlasenko55789c62008-06-18 16:30:42 +00004554 ) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004555 dest.o_assignment = DEFINITELY_ASSIGNMENT;
Denis Vlasenko55789c62008-06-18 16:30:42 +00004556 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004557 continue;
4558 }
Denis Vlasenko240c2552009-04-03 03:45:05 +00004559
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004560 if (is_ifs) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004561 if (done_word(&dest, &ctx)) {
4562 goto parse_error;
Eric Andersenaac75e52001-04-30 18:18:45 +00004563 }
Denis Vlasenko37181682009-04-03 03:19:15 +00004564 if (ch == '\n') {
Denis Vlasenkof1736072008-07-31 10:09:26 +00004565#if ENABLE_HUSH_CASE
4566 /* "case ... in <newline> word) ..." -
4567 * newlines are ignored (but ';' wouldn't be) */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004568 if (ctx.command->argv == NULL
4569 && ctx.ctx_res_w == RES_MATCH
Denis Vlasenkof1736072008-07-31 10:09:26 +00004570 ) {
4571 continue;
4572 }
4573#endif
Denis Vlasenko240c2552009-04-03 03:45:05 +00004574 /* Treat newline as a command separator. */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004575 done_pipe(&ctx, PIPE_SEQ);
4576 dest.o_assignment = MAYBE_ASSIGNMENT;
Denis Vlasenko240c2552009-04-03 03:45:05 +00004577 ch = ';';
Denis Vlasenko7c986122009-04-04 12:15:42 +00004578 /* note: if (is_ifs) continue;
Denis Vlasenko240c2552009-04-03 03:45:05 +00004579 * will still trigger for us */
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00004580 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004581 }
Denis Vlasenko240c2552009-04-03 03:45:05 +00004582 if (end_trigger && end_trigger == ch) {
4583//TODO: disallow "{ cmd }" without semicolon
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004584 if (done_word(&dest, &ctx)) {
4585 goto parse_error;
4586 }
4587 done_pipe(&ctx, PIPE_SEQ);
4588 dest.o_assignment = MAYBE_ASSIGNMENT;
Denis Vlasenko240c2552009-04-03 03:45:05 +00004589 /* Do we sit outside of any if's, loops or case's? */
Denis Vlasenko37181682009-04-03 03:19:15 +00004590 if (!HAS_KEYWORDS
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004591 IF_HAS_KEYWORDS(|| (ctx.ctx_res_w == RES_NONE && ctx.old_flag == 0))
Denis Vlasenko37181682009-04-03 03:19:15 +00004592 ) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004593 debug_printf_parse("parse_stream return %p: "
4594 "end_trigger char found\n",
4595 ctx.list_head);
4596 o_free(&dest);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004597#if !BB_MMU
4598 debug_printf_parse("as_string '%s'\n", ctx.as_string.data);
4599 if (pstring)
4600 *pstring = ctx.as_string.data;
4601 else
4602 o_free_unsafe(&ctx.as_string);
4603#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004604 return ctx.list_head;
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00004605 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004606 }
Denis Vlasenko6da69cd2009-04-04 12:12:58 +00004607 if (is_ifs)
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004608 continue;
Denis Vlasenko55789c62008-06-18 16:30:42 +00004609
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004610 if (dest.o_assignment == MAYBE_ASSIGNMENT) {
Denis Vlasenko55789c62008-06-18 16:30:42 +00004611 /* ch is a special char and thus this word
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004612 * cannot be an assignment */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004613 dest.o_assignment = NOT_ASSIGNMENT;
Denis Vlasenko55789c62008-06-18 16:30:42 +00004614 }
4615
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004616 next = '\0';
4617 if (ch != '\n') {
4618 next = i_peek(input);
4619 }
4620
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004621 switch (ch) {
Eric Andersen25f27032001-04-26 23:22:31 +00004622 case '#':
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004623 if (dest.length == 0) {
Denis Vlasenko0c886c62007-01-30 22:30:09 +00004624 while (1) {
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004625 ch = i_peek(input);
Denis Vlasenko0c886c62007-01-30 22:30:09 +00004626 if (ch == EOF || ch == '\n')
4627 break;
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004628 i_getch(input);
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004629 /* note: we do not add it to &ctx.as_string */
Denis Vlasenko0c886c62007-01-30 22:30:09 +00004630 }
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004631#if !BB_MMU
4632//TODO: go back one char?
4633 o_addchr(&ctx.as_string, '\n');
4634#endif
Eric Andersen25f27032001-04-26 23:22:31 +00004635 } else {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004636 o_addQchr(&dest, ch);
Eric Andersen25f27032001-04-26 23:22:31 +00004637 }
4638 break;
4639 case '\\':
4640 if (next == EOF) {
Denis Vlasenko90e485c2007-05-23 15:22:50 +00004641 syntax("\\<eof>");
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004642 goto parse_error;
Eric Andersen25f27032001-04-26 23:22:31 +00004643 }
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004644 o_addchr(&dest, '\\');
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004645 ch = i_getch(input);
4646 o_addchr(&dest, ch);
4647#if !BB_MMU
4648 o_addchr(&ctx.as_string, ch);
4649#endif
Eric Andersen25f27032001-04-26 23:22:31 +00004650 break;
4651 case '$':
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00004652 if (handle_dollar(&ctx.as_string, &dest, input) != 0) {
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004653 debug_printf_parse("parse_stream parse error: "
4654 "handle_dollar returned non-0\n");
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004655 goto parse_error;
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00004656 }
Eric Andersen25f27032001-04-26 23:22:31 +00004657 break;
4658 case '\'':
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004659 dest.nonnull = 1;
Denis Vlasenko0c886c62007-01-30 22:30:09 +00004660 while (1) {
Denis Vlasenko46ccdcb2008-06-10 18:05:12 +00004661 ch = i_getch(input);
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00004662 if (ch == EOF) {
4663 syntax("unterminated '");
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004664 goto parse_error;
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00004665 }
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004666#if !BB_MMU
4667 o_addchr(&ctx.as_string, ch);
4668#endif
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00004669 if (ch == '\'')
Denis Vlasenko0c886c62007-01-30 22:30:09 +00004670 break;
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004671 if (dest.o_assignment == NOT_ASSIGNMENT)
4672 o_addqchr(&dest, ch);
Denis Vlasenko55789c62008-06-18 16:30:42 +00004673 else
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004674 o_addchr(&dest, ch);
Eric Andersen25f27032001-04-26 23:22:31 +00004675 }
Eric Andersen25f27032001-04-26 23:22:31 +00004676 break;
4677 case '"':
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004678 dest.nonnull = 1;
Denis Vlasenko2f1d3942009-04-02 16:31:29 +00004679 is_in_dquote ^= 1; /* invert */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004680 if (dest.o_assignment == NOT_ASSIGNMENT)
4681 dest.o_escape ^= 1;
Eric Andersen25f27032001-04-26 23:22:31 +00004682 break;
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00004683#if ENABLE_HUSH_TICK
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004684 case '`': {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004685 //int pos = dest.length;
4686 o_addchr(&dest, SPECIAL_VAR_SYMBOL);
4687 o_addchr(&dest, '`');
4688 add_till_backquote(&dest, input);
4689 o_addchr(&dest, SPECIAL_VAR_SYMBOL);
4690 //debug_printf_subst("SUBST RES3 '%s'\n", dest.data + pos);
Eric Andersen25f27032001-04-26 23:22:31 +00004691 break;
Denis Vlasenko7b4f3f12008-06-10 18:04:32 +00004692 }
Denis Vlasenko14b5dd92007-05-20 21:51:38 +00004693#endif
Eric Andersen25f27032001-04-26 23:22:31 +00004694 case '>':
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004695 redir_fd = redirect_opt_num(&dest);
4696 if (done_word(&dest, &ctx)) {
4697 goto parse_error;
4698 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004699 redir_style = REDIRECT_OVERWRITE;
Eric Andersen25f27032001-04-26 23:22:31 +00004700 if (next == '>') {
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004701 redir_style = REDIRECT_APPEND;
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004702 ch = i_getch(input);
4703#if !BB_MMU
4704 o_addchr(&ctx.as_string, ch);
4705#endif
Denis Vlasenko90e485c2007-05-23 15:22:50 +00004706 }
4707#if 0
4708 else if (next == '(') {
4709 syntax(">(process) not supported");
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004710 goto parse_error;
Eric Andersen25f27032001-04-26 23:22:31 +00004711 }
Denis Vlasenko90e485c2007-05-23 15:22:50 +00004712#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004713 setup_redirect(&ctx, redir_fd, redir_style, input);
Eric Andersen25f27032001-04-26 23:22:31 +00004714 break;
4715 case '<':
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004716 redir_fd = redirect_opt_num(&dest);
4717 if (done_word(&dest, &ctx)) {
4718 goto parse_error;
4719 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004720 redir_style = REDIRECT_INPUT;
Eric Andersen25f27032001-04-26 23:22:31 +00004721 if (next == '<') {
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004722 redir_style = REDIRECT_HEREIS;
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004723 ch = i_getch(input);
4724#if !BB_MMU
4725 o_addchr(&ctx.as_string, ch);
4726#endif
Eric Andersen25f27032001-04-26 23:22:31 +00004727 } else if (next == '>') {
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004728 redir_style = REDIRECT_IO;
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004729 ch = i_getch(input);
4730#if !BB_MMU
4731 o_addchr(&ctx.as_string, ch);
4732#endif
Denis Vlasenko90e485c2007-05-23 15:22:50 +00004733 }
4734#if 0
4735 else if (next == '(') {
4736 syntax("<(process) not supported");
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004737 goto parse_error;
Eric Andersen25f27032001-04-26 23:22:31 +00004738 }
Denis Vlasenko90e485c2007-05-23 15:22:50 +00004739#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004740 setup_redirect(&ctx, redir_fd, redir_style, input);
Eric Andersen25f27032001-04-26 23:22:31 +00004741 break;
4742 case ';':
Denis Vlasenko17f02e72008-07-14 04:32:29 +00004743#if ENABLE_HUSH_CASE
4744 case_semi:
4745#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004746 if (done_word(&dest, &ctx)) {
4747 goto parse_error;
4748 }
4749 done_pipe(&ctx, PIPE_SEQ);
Denis Vlasenko17f02e72008-07-14 04:32:29 +00004750#if ENABLE_HUSH_CASE
4751 /* Eat multiple semicolons, detect
4752 * whether it means something special */
4753 while (1) {
4754 ch = i_peek(input);
4755 if (ch != ';')
4756 break;
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004757 ch = i_getch(input);
4758#if !BB_MMU
4759 o_addchr(&ctx.as_string, ch);
4760#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004761 if (ctx.ctx_res_w == RES_CASEI) {
4762 ctx.ctx_dsemicolon = 1;
4763 ctx.ctx_res_w = RES_MATCH;
Denis Vlasenko17f02e72008-07-14 04:32:29 +00004764 break;
4765 }
4766 }
4767#endif
Denis Vlasenko2b576b82008-08-04 00:46:07 +00004768 new_cmd:
4769 /* We just finished a cmd. New one may start
4770 * with an assignment */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004771 dest.o_assignment = MAYBE_ASSIGNMENT;
Eric Andersen25f27032001-04-26 23:22:31 +00004772 break;
4773 case '&':
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004774 if (done_word(&dest, &ctx)) {
4775 goto parse_error;
4776 }
Denis Vlasenkobb81c582007-01-30 22:32:09 +00004777 if (next == '&') {
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004778 ch = i_getch(input);
4779#if !BB_MMU
4780 o_addchr(&ctx.as_string, ch);
4781#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004782 done_pipe(&ctx, PIPE_AND);
Eric Andersen25f27032001-04-26 23:22:31 +00004783 } else {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004784 done_pipe(&ctx, PIPE_BG);
Eric Andersen25f27032001-04-26 23:22:31 +00004785 }
Denis Vlasenko2b576b82008-08-04 00:46:07 +00004786 goto new_cmd;
Eric Andersen25f27032001-04-26 23:22:31 +00004787 case '|':
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004788 if (done_word(&dest, &ctx)) {
4789 goto parse_error;
4790 }
Denis Vlasenkofbeeb322008-07-31 00:17:01 +00004791#if ENABLE_HUSH_CASE
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004792 if (ctx.ctx_res_w == RES_MATCH)
Denis Vlasenkof1736072008-07-31 10:09:26 +00004793 break; /* we are in case's "word | word)" */
Denis Vlasenkofbeeb322008-07-31 00:17:01 +00004794#endif
Denis Vlasenko2b576b82008-08-04 00:46:07 +00004795 if (next == '|') { /* || */
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004796 ch = i_getch(input);
4797#if !BB_MMU
4798 o_addchr(&ctx.as_string, ch);
4799#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004800 done_pipe(&ctx, PIPE_OR);
Eric Andersen25f27032001-04-26 23:22:31 +00004801 } else {
4802 /* we could pick up a file descriptor choice here
4803 * with redirect_opt_num(), but bash doesn't do it.
4804 * "echo foo 2| cat" yields "foo 2". */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004805 done_command(&ctx);
Eric Andersen25f27032001-04-26 23:22:31 +00004806 }
Denis Vlasenko2b576b82008-08-04 00:46:07 +00004807 goto new_cmd;
Eric Andersen25f27032001-04-26 23:22:31 +00004808 case '(':
Denis Vlasenko17f02e72008-07-14 04:32:29 +00004809#if ENABLE_HUSH_CASE
Denis Vlasenkof1736072008-07-31 10:09:26 +00004810 /* "case... in [(]word)..." - skip '(' */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004811 if (ctx.ctx_res_w == RES_MATCH
4812 && ctx.command->argv == NULL /* not (word|(... */
4813 && dest.length == 0 /* not word(... */
4814 && dest.nonnull == 0 /* not ""(... */
Denis Vlasenko17f02e72008-07-14 04:32:29 +00004815 ) {
4816 continue;
4817 }
4818#endif
Denis Vlasenko371de4a2008-10-14 12:43:13 +00004819#if ENABLE_HUSH_FUNCTIONS
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004820 if (dest.length != 0 /* not just () but word() */
4821 && dest.nonnull == 0 /* not a"b"c() */
4822 && ctx.command->argv == NULL /* it's the first word */
Denis Vlasenko371de4a2008-10-14 12:43:13 +00004823//TODO: "func ( ) {...}" - note spaces - is valid format too in bash
Denis Vlasenkoc3735272008-10-09 12:58:26 +00004824 && i_peek(input) == ')'
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004825 && !match_reserved_word(&dest)
Denis Vlasenkoc3735272008-10-09 12:58:26 +00004826 ) {
4827 bb_error_msg("seems like a function definition");
Denis Vlasenko22d10a02008-10-13 08:53:43 +00004828 i_getch(input);
Denis Vlasenko609f2ab2009-04-04 23:15:14 +00004829//if !BB_MMU o_addchr(&ctx.as_string...
Denis Vlasenko22d10a02008-10-13 08:53:43 +00004830 do {
Denis Vlasenko371de4a2008-10-14 12:43:13 +00004831//TODO: do it properly.
Denis Vlasenko22d10a02008-10-13 08:53:43 +00004832 ch = i_getch(input);
4833 } while (ch == ' ' || ch == '\n');
4834 if (ch != '{') {
4835 syntax("was expecting {");
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004836 goto parse_error;
Denis Vlasenko22d10a02008-10-13 08:53:43 +00004837 }
Denis Vlasenko371de4a2008-10-14 12:43:13 +00004838 ch = 'F'; /* magic value */
Denis Vlasenkoc3735272008-10-09 12:58:26 +00004839 }
4840#endif
Eric Andersen25f27032001-04-26 23:22:31 +00004841 case '{':
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004842 if (parse_group(&dest, &ctx, input, ch) != 0) {
4843 goto parse_error;
Denis Vlasenkoe725bfe2007-05-03 22:45:39 +00004844 }
Denis Vlasenko2b576b82008-08-04 00:46:07 +00004845 goto new_cmd;
Eric Andersen25f27032001-04-26 23:22:31 +00004846 case ')':
Denis Vlasenko17f02e72008-07-14 04:32:29 +00004847#if ENABLE_HUSH_CASE
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004848 if (ctx.ctx_res_w == RES_MATCH)
Denis Vlasenko17f02e72008-07-14 04:32:29 +00004849 goto case_semi;
4850#endif
Eric Andersen25f27032001-04-26 23:22:31 +00004851 case '}':
Denis Vlasenkoc3735272008-10-09 12:58:26 +00004852 /* proper use of this character is caught by end_trigger:
4853 * if we see {, we call parse_group(..., end_trigger='}')
4854 * and it will match } earlier (not here). */
Denis Vlasenkoa8442002008-06-14 11:00:17 +00004855 syntax("unexpected } or )");
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004856 goto parse_error;
Eric Andersen25f27032001-04-26 23:22:31 +00004857 default:
Denis Vlasenko5ec61322008-06-24 00:50:07 +00004858 if (HUSH_DEBUG)
Denis Vlasenko90e485c2007-05-23 15:22:50 +00004859 bb_error_msg_and_die("BUG: unexpected %c\n", ch);
Eric Andersen25f27032001-04-26 23:22:31 +00004860 }
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00004861 } /* while (1) */
Denis Vlasenko027e3fd2009-04-02 22:50:40 +00004862
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004863 parse_error:
4864 {
Denis Vlasenko60b392f2009-04-03 19:14:32 +00004865 struct parse_context *pctx;
4866 IF_HAS_KEYWORDS(struct parse_context *p2;)
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004867
4868 /* Clean up allocated tree.
4869 * Samples for finding leaks on syntax error recovery path.
Denis Vlasenkoa24c8ca2009-04-04 15:24:40 +00004870 * Run them from interactive shell, watch pmap `pidof hush`.
4871 * while if false; then false; fi do break; done
4872 * (bash accepts it)
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004873 * while if false; then false; fi; do break; fi
Denis Vlasenkocc4c6932009-04-05 07:38:48 +00004874 * Samples to catch leaks at execution:
4875 * while if (true | {true;}); then echo ok; fi; do break; done
4876 * while if (true | {true;}); then echo ok; fi; do (if echo ok; break; then :; fi) | cat; break; done
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004877 */
4878 pctx = &ctx;
4879 do {
4880 /* Update pipe/command counts,
4881 * otherwise freeing may miss some */
4882 done_pipe(pctx, PIPE_SEQ);
4883 debug_printf_clean("freeing list %p from ctx %p\n",
4884 pctx->list_head, pctx);
4885 debug_print_tree(pctx->list_head, 0);
4886 free_pipe_list(pctx->list_head, 0);
4887 debug_printf_clean("freed list %p\n", pctx->list_head);
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004888#if !BB_MMU
4889 o_free_unsafe(&pctx->as_string);
4890#endif
Denis Vlasenko60b392f2009-04-03 19:14:32 +00004891 IF_HAS_KEYWORDS(p2 = pctx->stack;)
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004892 if (pctx != &ctx) {
4893 free(pctx);
4894 }
Denis Vlasenko60b392f2009-04-03 19:14:32 +00004895 IF_HAS_KEYWORDS(pctx = p2;)
4896 } while (HAS_KEYWORDS && pctx);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004897 /* Free text, clear all dest fields */
4898 o_free(&dest);
4899 /* If we are not in top-level parse, we return,
4900 * our caller will propagate error.
4901 */
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004902 if (end_trigger != ';') {
4903#if !BB_MMU
4904 if (pstring)
4905 *pstring = NULL;
4906#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004907 return ERR_PTR;
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004908 }
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004909 /* Discard cached input, force prompt */
4910 input->p = NULL;
Denis Vlasenko60b392f2009-04-03 19:14:32 +00004911 USE_HUSH_INTERACTIVE(input->promptme = 1;)
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004912 goto reset;
Denis Vlasenko027e3fd2009-04-02 22:50:40 +00004913 }
Eric Andersen25f27032001-04-26 23:22:31 +00004914}
4915
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004916/* Executing from string: eval, sh -c '...'
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004917 * or from file: /etc/profile, . file, sh <script>, sh (intereactive)
4918 * end_trigger controls how often we stop parsing
4919 * NUL: parse all, execute, return
4920 * ';': parse till ';' or newline, execute, repeat till EOF
4921 */
4922static void parse_and_run_stream(struct in_str *inp, int end_trigger)
Eric Andersen25f27032001-04-26 23:22:31 +00004923{
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004924 while (1) {
4925 struct pipe *pipe_list;
Denis Vlasenkof8d01d32008-06-14 17:13:20 +00004926
Denis Vlasenko9aa7d6f2009-04-04 22:47:50 +00004927 pipe_list = parse_stream(NULL, inp, end_trigger);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004928 if (!pipe_list) /* EOF */
4929 break;
4930 debug_print_tree(pipe_list, 0);
4931 debug_printf_exec("parse_and_run_stream: run_and_free_list\n");
4932 run_and_free_list(pipe_list);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004933 }
Eric Andersen25f27032001-04-26 23:22:31 +00004934}
4935
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004936static void parse_and_run_string(const char *s)
Eric Andersen25f27032001-04-26 23:22:31 +00004937{
4938 struct in_str input;
4939 setup_string_in_str(&input, s);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004940 parse_and_run_stream(&input, '\0');
Eric Andersen25f27032001-04-26 23:22:31 +00004941}
4942
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004943static void parse_and_run_file(FILE *f)
Eric Andersen25f27032001-04-26 23:22:31 +00004944{
Eric Andersen25f27032001-04-26 23:22:31 +00004945 struct in_str input;
4946 setup_file_in_str(&input, f);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00004947 parse_and_run_stream(&input, ';');
Eric Andersen25f27032001-04-26 23:22:31 +00004948}
4949
Denis Vlasenkof9375282009-04-05 19:13:39 +00004950/* Called a few times only (or even once if "sh -c") */
4951static void block_signals(int second_time)
Eric Andersen52a97ca2001-06-22 06:49:26 +00004952{
Denis Vlasenkof9375282009-04-05 19:13:39 +00004953 unsigned sig;
4954 unsigned mask;
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00004955
Denis Vlasenkof9375282009-04-05 19:13:39 +00004956 mask = (1 << SIGQUIT);
4957 if (G_interactive_fd) {
4958 mask = 0
4959 | (1 << SIGQUIT)
4960 | (1 << SIGTERM)
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00004961//TODO | (1 << SIGHUP)
Denis Vlasenkof9375282009-04-05 19:13:39 +00004962#if ENABLE_HUSH_JOB
4963 | (1 << SIGTTIN) | (1 << SIGTTOU) | (1 << SIGTSTP)
4964#endif
4965 | (1 << SIGINT)
4966 ;
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00004967 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00004968 G.non_DFL_mask = mask;
Eric Andersen52a97ca2001-06-22 06:49:26 +00004969
Denis Vlasenkof9375282009-04-05 19:13:39 +00004970 if (!second_time)
4971 sigprocmask(SIG_SETMASK, NULL, &G.blocked_set);
4972 sig = 0;
4973 while (mask) {
4974 if (mask & 1)
4975 sigaddset(&G.blocked_set, sig);
4976 mask >>= 1;
4977 sig++;
4978 }
4979 sigdelset(&G.blocked_set, SIGCHLD);
4980
4981 sigprocmask(SIG_SETMASK, &G.blocked_set,
4982 second_time ? NULL : &G.inherited_set);
4983 /* POSIX allows shell to re-enable SIGCHLD
4984 * even if it was SIG_IGN on entry */
4985// G.count_SIGCHLD++; /* ensure it is != G.handled_SIGCHLD */
4986 if (!second_time)
4987 signal(SIGCHLD, SIG_DFL); // SIGCHLD_handler);
4988}
4989
4990#if ENABLE_HUSH_JOB
4991/* helper */
4992static void maybe_set_to_sigexit(int sig)
4993{
4994 void (*handler)(int);
4995 /* non_DFL_mask'ed signals are, well, masked,
4996 * no need to set handler for them.
4997 */
4998 if (!((G.non_DFL_mask >> sig) & 1)) {
4999 handler = signal(sig, sigexit);
5000 if (handler == SIG_IGN) /* oops... restore back to IGN! */
5001 signal(sig, handler);
5002 }
5003}
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00005004/* Set handlers to restore tty pgrp and exit */
Denis Vlasenkof9375282009-04-05 19:13:39 +00005005static void set_fatal_handlers(void)
5006{
Denis Vlasenkoa6c467f2007-05-05 15:10:52 +00005007 /* We _must_ restore tty pgrp on fatal signals */
Denis Vlasenkof9375282009-04-05 19:13:39 +00005008 if (HUSH_DEBUG) {
5009 maybe_set_to_sigexit(SIGILL );
5010 maybe_set_to_sigexit(SIGFPE );
5011 maybe_set_to_sigexit(SIGBUS );
5012 maybe_set_to_sigexit(SIGSEGV);
5013 maybe_set_to_sigexit(SIGTRAP);
5014 } /* else: hush is perfect. what SEGV? */
5015 maybe_set_to_sigexit(SIGABRT);
5016 /* bash 3.2 seems to handle these just like 'fatal' ones */
5017 maybe_set_to_sigexit(SIGPIPE);
5018 maybe_set_to_sigexit(SIGALRM);
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00005019//TODO: disable and move down when proper SIGHUP handling is added
Denis Vlasenkof9375282009-04-05 19:13:39 +00005020 maybe_set_to_sigexit(SIGHUP );
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00005021 /* if we are interactive, [SIGHUP,] SIGTERM and SIGINT are masked.
Denis Vlasenkof9375282009-04-05 19:13:39 +00005022 * if we aren't interactive... but in this case
5023 * we never want to restore pgrp on exit, and this fn is not called */
5024 /*maybe_set_to_sigexit(SIGTERM);*/
5025 /*maybe_set_to_sigexit(SIGINT );*/
Eric Andersen6c947d22001-06-25 22:24:38 +00005026}
Denis Vlasenkob81b3df2007-04-28 16:48:04 +00005027#endif
Eric Andersenada18ff2001-05-21 16:18:22 +00005028
Denis Vlasenkod5762932009-03-31 11:22:57 +00005029static int set_mode(const char cstate, const char mode)
5030{
5031 int state = (cstate == '-' ? 1 : 0);
5032 switch (mode) {
5033 case 'n': G.fake_mode = state; break;
5034 case 'x': /*G.debug_mode = state;*/ break;
5035 default: return EXIT_FAILURE;
5036 }
5037 return EXIT_SUCCESS;
5038}
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005039
Denis Vlasenko9b49a5e2007-10-11 10:05:36 +00005040int hush_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
Matt Kraai2d91deb2001-08-01 17:21:35 +00005041int hush_main(int argc, char **argv)
Eric Andersen25f27032001-04-26 23:22:31 +00005042{
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00005043 static const struct variable const_shell_ver = {
5044 .next = NULL,
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +00005045 .varstr = (char*)hush_version_str,
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00005046 .max_len = 1, /* 0 can provoke free(name) */
5047 .flg_export = 1,
5048 .flg_read_only = 1,
5049 };
Denis Vlasenkof9375282009-04-05 19:13:39 +00005050 int signal_mask_is_inited = 0;
Eric Andersen25f27032001-04-26 23:22:31 +00005051 int opt;
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00005052 char **e;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00005053 struct variable *cur_var;
Eric Andersenbc604a22001-05-16 05:24:03 +00005054
Denis Vlasenko574f2f42008-02-27 18:41:59 +00005055 INIT_G();
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00005056 if (EXIT_SUCCESS) /* if EXIT_SUCCESS == 0, is already done */
5057 G.last_return_code = EXIT_SUCCESS;
5058#if !BB_MMU
5059 G.argv0_for_re_execing = argv[0];
5060#endif
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00005061 /* Deal with HUSH_VERSION */
Denis Vlasenko87a86552008-07-29 19:43:10 +00005062 G.shell_ver = const_shell_ver; /* copying struct here */
5063 G.top_var = &G.shell_ver;
Denis Vlasenkof886fd22008-10-13 12:36:05 +00005064 debug_printf_env("unsetenv '%s'\n", "HUSH_VERSION");
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00005065 unsetenv("HUSH_VERSION"); /* in case it exists in initial env */
5066 /* Initialize our shell local variables with the values
Denis Vlasenkod76c0492007-05-25 02:16:25 +00005067 * currently living in the environment */
Denis Vlasenko87a86552008-07-29 19:43:10 +00005068 cur_var = G.top_var;
Denis Vlasenko0a83fc32007-05-25 11:12:32 +00005069 e = environ;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00005070 if (e) while (*e) {
5071 char *value = strchr(*e, '=');
5072 if (value) { /* paranoia */
5073 cur_var->next = xzalloc(sizeof(*cur_var));
5074 cur_var = cur_var->next;
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00005075 cur_var->varstr = *e;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00005076 cur_var->max_len = strlen(*e);
5077 cur_var->flg_export = 1;
5078 }
5079 e++;
5080 }
Denis Vlasenkof886fd22008-10-13 12:36:05 +00005081 debug_printf_env("putenv '%s'\n", hush_version_str);
Denis Vlasenkoafd7a8d2008-10-09 16:29:44 +00005082 putenv((char *)hush_version_str); /* reinstate HUSH_VERSION */
Denis Vlasenko38f63192007-01-22 09:03:07 +00005083#if ENABLE_FEATURE_EDITING
Denis Vlasenko87a86552008-07-29 19:43:10 +00005084 G.line_input_state = new_line_input_t(FOR_SHELL);
Denis Vlasenko8e1c7152007-01-22 07:21:38 +00005085#endif
Denis Vlasenko87a86552008-07-29 19:43:10 +00005086 G.global_argc = argc;
5087 G.global_argv = argv;
Eric Andersen94ac2442001-05-22 19:05:18 +00005088 /* Initialize some more globals to non-zero values */
5089 set_cwd();
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00005090#if ENABLE_HUSH_INTERACTIVE
Mike Frysingerec2c6552009-03-28 12:24:44 +00005091 if (ENABLE_FEATURE_EDITING)
5092 cmdedit_set_initial_prompt();
Denis Vlasenko87a86552008-07-29 19:43:10 +00005093 G.PS2 = "> ";
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00005094#endif
Denis Vlasenkoc8be5ee2007-05-17 15:38:46 +00005095
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00005096 /* Shell is non-interactive at first. We need to call
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00005097 * block_signals(0) if we are going to execute "sh <script>",
5098 * "sh -c <cmds>" or login shell's /etc/profile and friends.
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00005099 * If we later decide that we are interactive, we run block_signals(0)
5100 * (or re-run block_signals(1) if we ran block_signals(0) before)
5101 * in order to intercept (more) signals.
5102 */
5103
5104 /* Parse options */
Mike Frysinger19a7ea12009-03-28 13:02:11 +00005105 /* http://www.opengroup.org/onlinepubs/9699919799/utilities/sh.html */
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00005106 while (1) {
5107 opt = getopt(argc, argv, "c:xins"
5108#if !BB_MMU
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00005109 "$:!:?:D:R:V:"
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00005110#endif
5111 );
5112 if (opt <= 0)
5113 break;
Eric Andersen25f27032001-04-26 23:22:31 +00005114 switch (opt) {
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00005115 case 'c':
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00005116 if (!G.root_pid)
5117 G.root_pid = getpid();
Denis Vlasenko87a86552008-07-29 19:43:10 +00005118 G.global_argv = argv + optind;
Denis Vlasenkoa8b6dff2009-03-20 12:05:14 +00005119 if (!argv[optind]) {
5120 /* -c 'script' (no params): prevent empty $0 */
5121 *--G.global_argv = argv[0];
5122 optind--;
5123 } /* else -c 'script' PAR0 PAR1: $0 is PAR0 */
Denis Vlasenko87a86552008-07-29 19:43:10 +00005124 G.global_argc = argc - optind;
Denis Vlasenkof9375282009-04-05 19:13:39 +00005125 block_signals(0); /* 0: called 1st time */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005126 parse_and_run_string(optarg);
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00005127 goto final_return;
5128 case 'i':
Denis Vlasenkoc666f712007-05-16 22:18:54 +00005129 /* Well, we cannot just declare interactiveness,
5130 * we have to have some stuff (ctty, etc) */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005131 /* G_interactive_fd++; */
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00005132 break;
Mike Frysinger19a7ea12009-03-28 13:02:11 +00005133 case 's':
5134 /* "-s" means "read from stdin", but this is how we always
5135 * operate, so simply do nothing here. */
5136 break;
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00005137#if !BB_MMU
5138 case '$':
Denis Vlasenko34e573d2009-04-06 12:56:28 +00005139 G.root_pid = bb_strtou(optarg, &optarg, 16);
5140 optarg++;
5141 G.last_bg_pid = bb_strtou(optarg, &optarg, 16);
5142 optarg++;
5143 G.last_return_code = bb_strtou(optarg, &optarg, 16);
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00005144# if ENABLE_HUSH_LOOPS
Denis Vlasenko34e573d2009-04-06 12:56:28 +00005145 optarg++;
5146 G.depth_of_loop = bb_strtou(optarg, &optarg, 16);
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00005147# endif
Denis Vlasenko34e573d2009-04-06 12:56:28 +00005148 break;
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00005149 case 'R':
5150 case 'V':
5151 set_local_var(xstrdup(optarg), 0, opt == 'R');
5152 break;
5153#endif
Mike Frysingerad88d5a2009-03-28 13:44:51 +00005154 case 'n':
5155 case 'x':
Denis Vlasenkod5762932009-03-31 11:22:57 +00005156 if (!set_mode('-', opt))
Mike Frysingerad88d5a2009-03-28 13:44:51 +00005157 break;
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00005158 default:
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00005159#ifndef BB_VER
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00005160 fprintf(stderr, "Usage: sh [FILE]...\n"
5161 " or: sh -c command [args]...\n\n");
5162 exit(EXIT_FAILURE);
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00005163#else
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00005164 bb_show_usage();
Eric Andersen9ffb7dd2001-05-19 03:00:46 +00005165#endif
Eric Andersen25f27032001-04-26 23:22:31 +00005166 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00005167 } /* option parsing loop */
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00005168
5169 if (!G.root_pid)
5170 G.root_pid = getpid();
Denis Vlasenkof9375282009-04-05 19:13:39 +00005171
5172 /* If we are login shell... */
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00005173 if (argv[0] && argv[0][0] == '-') {
5174 FILE *input;
5175 /* XXX what should argv be while sourcing /etc/profile? */
5176 debug_printf("sourcing /etc/profile\n");
5177 input = fopen_for_read("/etc/profile");
5178 if (input != NULL) {
5179 close_on_exec_on(fileno(input));
Denis Vlasenkof9375282009-04-05 19:13:39 +00005180 block_signals(0); /* 0: called 1st time */
5181 signal_mask_is_inited = 1;
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00005182 parse_and_run_file(input);
5183 fclose(input);
5184 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00005185 /* bash: after sourcing /etc/profile,
5186 * tries to source (in the given order):
5187 * ~/.bash_profile, ~/.bash_login, ~/.profile,
5188 * stopping of first found. --noprofile turns this off.
5189 * bash also sources ~/.bash_logout on exit.
5190 * If called as sh, skips .bash_XXX files.
5191 */
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00005192 }
5193
Denis Vlasenkof9375282009-04-05 19:13:39 +00005194 if (argv[optind]) {
5195 FILE *input;
5196 /*
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00005197 * "bash <script>" (which is never interactive (unless -i?))
5198 * sources $BASH_ENV here (without scanning $PATH).
Denis Vlasenkof9375282009-04-05 19:13:39 +00005199 * If called as sh, does the same but with $ENV.
5200 */
5201 debug_printf("running script '%s'\n", argv[optind]);
5202 G.global_argv = argv + optind;
5203 G.global_argc = argc - optind;
5204 input = xfopen_for_read(argv[optind]);
5205 close_on_exec_on(fileno(input));
5206 if (!signal_mask_is_inited)
5207 block_signals(0); /* 0: called 1st time */
5208 parse_and_run_file(input);
5209#if ENABLE_FEATURE_CLEAN_UP
5210 fclose(input);
5211#endif
5212 goto final_return;
5213 }
5214
Denis Vlasenkoc4a7af52009-04-05 20:33:27 +00005215 /* Up to here, shell was non-interactive. Now it may become one.
5216 * NB: don't forget to (re)run block_signals(0/1) as needed.
5217 */
Denis Vlasenkof9375282009-04-05 19:13:39 +00005218
Denis Vlasenkofbf6dea2007-04-13 19:56:56 +00005219 /* A shell is interactive if the '-i' flag was given, or if all of
Eric Andersen25f27032001-04-26 23:22:31 +00005220 * the following conditions are met:
Denis Vlasenko55b2de72007-04-18 17:21:28 +00005221 * no -c command
Eric Andersen25f27032001-04-26 23:22:31 +00005222 * no arguments remaining or the -s flag given
5223 * standard input is a terminal
5224 * standard output is a terminal
Denis Vlasenkof9375282009-04-05 19:13:39 +00005225 * Refer to Posix.2, the description of the 'sh' utility.
5226 */
5227#if ENABLE_HUSH_JOB
5228 if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
Denis Vlasenko87a86552008-07-29 19:43:10 +00005229 G.saved_tty_pgrp = tcgetpgrp(STDIN_FILENO);
Denis Vlasenkof9375282009-04-05 19:13:39 +00005230 debug_printf("saved_tty_pgrp:%d\n", G.saved_tty_pgrp);
Denis Vlasenkod3f973e2009-04-06 10:21:42 +00005231//TODO: "interactive" and "have job control" are two different things.
5232//If tcgetpgrp fails here, "have job control" is false, but "interactive"
5233//should stay on! Currently, we mix these into one.
Denis Vlasenko87a86552008-07-29 19:43:10 +00005234 if (G.saved_tty_pgrp >= 0) {
Denis Vlasenkof9375282009-04-05 19:13:39 +00005235 /* try to dup stdin to high fd#, >= 255 */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005236 G_interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
5237 if (G_interactive_fd < 0) {
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00005238 /* try to dup to any fd */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005239 G_interactive_fd = dup(STDIN_FILENO);
5240 if (G_interactive_fd < 0)
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00005241 /* give up */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005242 G_interactive_fd = 0;
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00005243 }
Denis Vlasenko46f9b6d2009-04-05 10:39:03 +00005244// TODO: track & disallow any attempts of user
5245// to (inadvertently) close/redirect it
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00005246 }
Eric Andersen25f27032001-04-26 23:22:31 +00005247 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00005248 debug_printf("interactive_fd:%d\n", G_interactive_fd);
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005249 if (G_interactive_fd) {
Denis Vlasenkof9375282009-04-05 19:13:39 +00005250 pid_t shell_pgrp;
5251
5252 /* We are indeed interactive shell, and we will perform
5253 * job control. Setting up for that. */
5254
5255 close_on_exec_on(G_interactive_fd);
5256 /* If we were run as 'hush &', sleep until we are
5257 * in the foreground (tty pgrp == our pgrp).
5258 * If we get started under a job aware app (like bash),
5259 * make sure we are now in charge so we don't fight over
5260 * who gets the foreground */
5261 while (1) {
5262 shell_pgrp = getpgrp();
5263 G.saved_tty_pgrp = tcgetpgrp(G_interactive_fd);
5264 if (G.saved_tty_pgrp == shell_pgrp)
5265 break;
5266 /* send TTIN to ourself (should stop us) */
5267 kill(- shell_pgrp, SIGTTIN);
5268 }
5269 /* Block some signals */
5270 block_signals(signal_mask_is_inited);
5271 /* Set other signals to restore saved_tty_pgrp */
5272 set_fatal_handlers();
5273 /* Put ourselves in our own process group */
5274 bb_setpgrp(); /* is the same as setpgid(our_pid, our_pid); */
5275 /* Grab control of the terminal */
5276 tcsetpgrp(G_interactive_fd, getpid());
Denis Vlasenko4ecfcdc2008-02-11 08:32:31 +00005277 /* -1 is special - makes xfuncs longjmp, not exit
Denis Vlasenkoc04163a2008-02-11 08:30:53 +00005278 * (we reset die_sleep = 0 whereever we [v]fork) */
5279 die_sleep = -1;
Denis Vlasenko54e7ffb2007-04-21 00:03:36 +00005280 if (setjmp(die_jmp)) {
5281 /* xfunc has failed! die die die */
5282 hush_exit(xfunc_error_retval);
5283 }
Denis Vlasenkof9375282009-04-05 19:13:39 +00005284 } else if (!signal_mask_is_inited) {
5285 block_signals(0); /* 0: called 1st time */
5286 } /* else: block_signals(0) was done before */
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00005287#elif ENABLE_HUSH_INTERACTIVE
Denis Vlasenkof9375282009-04-05 19:13:39 +00005288 /* No job control compiled in, only prompt/line editing */
5289 if (isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)) {
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005290 G_interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
5291 if (G_interactive_fd < 0) {
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00005292 /* try to dup to any fd */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005293 G_interactive_fd = dup(STDIN_FILENO);
5294 if (G_interactive_fd < 0)
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00005295 /* give up */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005296 G_interactive_fd = 0;
Denis Vlasenkoe3f2f892007-04-28 16:48:27 +00005297 }
5298 }
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005299 if (G_interactive_fd) {
Denis Vlasenkof9375282009-04-05 19:13:39 +00005300 close_on_exec_on(G_interactive_fd);
5301 block_signals(signal_mask_is_inited);
5302 } else if (!signal_mask_is_inited) {
5303 block_signals(0);
5304 }
5305#else
5306 /* We have interactiveness code disabled */
5307 if (!signal_mask_is_inited) {
5308 block_signals(0);
5309 }
5310#endif
5311 /* bash:
5312 * if interactive but not a login shell, sources ~/.bashrc
5313 * (--norc turns this off, --rcfile <file> overrides)
5314 */
5315
5316 if (!ENABLE_FEATURE_SH_EXTRA_QUIET && G_interactive_fd) {
Mike Frysinger258275d2009-04-05 21:19:43 +00005317 printf("\n\n%s hush - the humble shell\n", bb_banner);
Mike Frysingerb2705e12009-03-23 08:44:02 +00005318 printf("Enter 'help' for a list of built-in commands.\n\n");
5319 }
5320
Denis Vlasenkof9375282009-04-05 19:13:39 +00005321 parse_and_run_file(stdin);
Eric Andersen25f27032001-04-26 23:22:31 +00005322
Denis Vlasenkod76c0492007-05-25 02:16:25 +00005323 final_return:
Denis Vlasenko38f63192007-01-22 09:03:07 +00005324#if ENABLE_FEATURE_CLEAN_UP
Denis Vlasenko87a86552008-07-29 19:43:10 +00005325 if (G.cwd != bb_msg_unknown)
5326 free((char*)G.cwd);
5327 cur_var = G.top_var->next;
Denis Vlasenkod76c0492007-05-25 02:16:25 +00005328 while (cur_var) {
5329 struct variable *tmp = cur_var;
5330 if (!cur_var->max_len)
Denis Vlasenko28c0f0f2007-05-25 02:46:01 +00005331 free(cur_var->varstr);
Denis Vlasenkod76c0492007-05-25 02:16:25 +00005332 cur_var = cur_var->next;
5333 free(tmp);
Eric Andersenaeb44c42001-05-22 20:29:00 +00005334 }
Eric Andersen25f27032001-04-26 23:22:31 +00005335#endif
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005336 hush_exit(G.last_return_code);
Eric Andersen25f27032001-04-26 23:22:31 +00005337}
Denis Vlasenko96702ca2007-11-23 23:28:55 +00005338
5339
5340#if ENABLE_LASH
5341int lash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
5342int lash_main(int argc, char **argv)
5343{
5344 //bb_error_msg("lash is deprecated, please use hush instead");
5345 return hush_main(argc, argv);
5346}
5347#endif
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005348
5349
5350/*
5351 * Built-ins
5352 */
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005353static int builtin_trap(char **argv)
5354{
Denis Vlasenkod5762932009-03-31 11:22:57 +00005355 int i;
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005356 int sig;
Denis Vlasenkod5762932009-03-31 11:22:57 +00005357 char *new_cmd;
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005358
5359 if (!G.traps)
Denis Vlasenkod5762932009-03-31 11:22:57 +00005360 G.traps = xzalloc(sizeof(G.traps[0]) * NSIG);
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005361
Denis Vlasenkoc8d27332009-04-06 10:47:21 +00005362 argv++;
5363 if (!*argv) {
5364 /* No args: print all trapped. This isn't 100% correct as we
5365 * should be escaping the cmd so that it can be pasted back in
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005366 */
5367 for (i = 0; i < NSIG; ++i)
Denis Vlasenkod5762932009-03-31 11:22:57 +00005368 if (G.traps[i])
5369 printf("trap -- '%s' %s\n", G.traps[i], get_signame(i));
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005370 return EXIT_SUCCESS;
5371 }
5372
Denis Vlasenkod5762932009-03-31 11:22:57 +00005373 new_cmd = NULL;
5374 i = 0;
Denis Vlasenkoc8d27332009-04-06 10:47:21 +00005375 /* If first arg is decimal: reset all specified signals */
5376 sig = bb_strtou(*argv, NULL, 10);
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005377 if (errno == 0) {
5378 int ret;
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005379 set_all:
5380 ret = EXIT_SUCCESS;
Denis Vlasenkod5762932009-03-31 11:22:57 +00005381 while (*argv) {
5382 sig = get_signum(*argv++);
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005383 if (sig < 0 || sig >= NSIG) {
5384 ret = EXIT_FAILURE;
Denis Vlasenkoc8d27332009-04-06 10:47:21 +00005385 /* Mimic bash message exactly */
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005386 bb_perror_msg("trap: %s: invalid signal specification", argv[i]);
5387 continue;
5388 }
5389
Denis Vlasenkod5762932009-03-31 11:22:57 +00005390 free(G.traps[sig]);
5391 G.traps[sig] = xstrdup(new_cmd);
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005392
Denis Vlasenkod5762932009-03-31 11:22:57 +00005393 debug_printf("trap: setting SIG%s (%i) to '%s'",
5394 get_signame(sig), sig, G.traps[sig]);
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005395
5396 /* There is no signal for 0 (EXIT) */
5397 if (sig == 0)
5398 continue;
5399
5400 if (new_cmd) {
Denis Vlasenkod5762932009-03-31 11:22:57 +00005401 sigaddset(&G.blocked_set, sig);
5402 } else {
Denis Vlasenkoc8d27332009-04-06 10:47:21 +00005403 /* There was a trap handler, we are removing it
Denis Vlasenkod5762932009-03-31 11:22:57 +00005404 * (if sig has non-DFL handling,
5405 * we don't need to do anything) */
5406 if (sig < 32 && (G.non_DFL_mask & (1 << sig)))
5407 continue;
5408 sigdelset(&G.blocked_set, sig);
5409 }
5410 sigprocmask(SIG_SETMASK, &G.blocked_set, NULL);
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005411 }
5412 return ret;
5413 }
5414
Denis Vlasenkoc8d27332009-04-06 10:47:21 +00005415 /* First arg is "-": reset all specified to default */
5416 /* First arg is "": ignore all specified */
5417 /* Everything else: execute first arg upon signal */
Denis Vlasenkod5762932009-03-31 11:22:57 +00005418 if (!argv[1]) {
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005419 bb_error_msg("trap: invalid arguments");
5420 return EXIT_FAILURE;
5421 }
Denis Vlasenkoc8d27332009-04-06 10:47:21 +00005422 if (NOT_LONE_DASH(*argv))
Denis Vlasenkod5762932009-03-31 11:22:57 +00005423 new_cmd = *argv;
5424 argv++;
Mike Frysinger9f8128f2009-03-29 23:49:37 +00005425 goto set_all;
5426}
5427
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00005428static int builtin_true(char **argv UNUSED_PARAM)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005429{
5430 return 0;
5431}
5432
5433static int builtin_test(char **argv)
5434{
5435 int argc = 0;
5436 while (*argv) {
5437 argc++;
5438 argv++;
5439 }
5440 return test_main(argc, argv - argc);
5441}
5442
5443static int builtin_echo(char **argv)
5444{
5445 int argc = 0;
5446 while (*argv) {
5447 argc++;
5448 argv++;
5449 }
5450 return echo_main(argc, argv - argc);
5451}
5452
5453static int builtin_eval(char **argv)
5454{
5455 int rcode = EXIT_SUCCESS;
5456
Denis Vlasenkob0a64782009-04-06 11:33:07 +00005457 if (*++argv) {
5458 char *str = expand_strvec_to_string(argv);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005459 /* bash:
5460 * eval "echo Hi; done" ("done" is syntax error):
5461 * "echo Hi" will not execute too.
5462 */
5463 parse_and_run_string(str);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005464 free(str);
Denis Vlasenko87a86552008-07-29 19:43:10 +00005465 rcode = G.last_return_code;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005466 }
5467 return rcode;
5468}
5469
5470static int builtin_cd(char **argv)
5471{
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005472 const char *newdir = argv[1];
5473 if (newdir == NULL) {
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005474 /* bash does nothing (exitcode 0) if HOME is ""; if it's unset,
5475 * bash says "bash: cd: HOME not set" and does nothing (exitcode 1)
5476 */
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005477 newdir = getenv("HOME") ? : "/";
Denis Vlasenkob0a64782009-04-06 11:33:07 +00005478 }
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005479 if (chdir(newdir)) {
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005480 /* Mimic bash message exactly */
5481 bb_perror_msg("cd: %s", newdir);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005482 return EXIT_FAILURE;
5483 }
5484 set_cwd();
5485 return EXIT_SUCCESS;
5486}
5487
5488static int builtin_exec(char **argv)
5489{
Denis Vlasenkob0a64782009-04-06 11:33:07 +00005490 if (*++argv == NULL)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005491 return EXIT_SUCCESS; /* bash does this */
5492 {
5493#if !BB_MMU
Denis Vlasenkof886fd22008-10-13 12:36:05 +00005494 nommu_save_t dummy;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005495#endif
5496// FIXME: if exec fails, bash does NOT exit! We do...
Denis Vlasenkob0a64782009-04-06 11:33:07 +00005497 pseudo_exec_argv(&dummy, argv, 0, NULL);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005498 /* never returns */
5499 }
5500}
5501
5502static int builtin_exit(char **argv)
5503{
Denis Vlasenkocd418a22009-04-06 18:08:35 +00005504 debug_printf_exec("%s()\n", __func__);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005505// TODO: bash does it ONLY on top-level sh exit (+interacive only?)
5506 //puts("exit"); /* bash does it */
5507// TODO: warn if we have background jobs: "There are stopped jobs"
5508// On second consecutive 'exit', exit anyway.
Denis Vlasenkob0a64782009-04-06 11:33:07 +00005509 if (*++argv == NULL)
Denis Vlasenko87a86552008-07-29 19:43:10 +00005510 hush_exit(G.last_return_code);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005511 /* mimic bash: exit 123abc == exit 255 + error msg */
5512 xfunc_error_retval = 255;
5513 /* bash: exit -2 == exit 254, no error msg */
Denis Vlasenkob0a64782009-04-06 11:33:07 +00005514 hush_exit(xatoi(*argv) & 0xff);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005515}
5516
5517static int builtin_export(char **argv)
5518{
Denis Vlasenkob0a64782009-04-06 11:33:07 +00005519 if (*++argv == NULL) {
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005520 // TODO:
5521 // ash emits: export VAR='VAL'
5522 // bash: declare -x VAR="VAL"
5523 // (both also escape as needed (quotes, $, etc))
5524 char **e = environ;
5525 if (e)
5526 while (*e)
5527 puts(*e++);
5528 return EXIT_SUCCESS;
5529 }
5530
Denis Vlasenkob0a64782009-04-06 11:33:07 +00005531 do {
5532 const char *value;
5533 char *name = *argv;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005534
Denis Vlasenkob0a64782009-04-06 11:33:07 +00005535 value = strchr(name, '=');
5536 if (!value) {
5537 /* They are exporting something without a =VALUE */
5538 struct variable *var;
5539
5540 var = get_local_var(name);
5541 if (var) {
5542 var->flg_export = 1;
5543 debug_printf_env("%s: putenv '%s'\n", __func__, var->varstr);
5544 putenv(var->varstr);
5545 }
5546 /* bash does not return an error when trying to export
5547 * an undefined variable. Do likewise. */
5548 continue;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005549 }
Denis Vlasenkob0a64782009-04-06 11:33:07 +00005550 set_local_var(xstrdup(name), 1, 0);
5551 } while (*++argv);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005552
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005553 return EXIT_SUCCESS;
5554}
5555
5556#if ENABLE_HUSH_JOB
5557/* built-in 'fg' and 'bg' handler */
5558static int builtin_fg_bg(char **argv)
5559{
5560 int i, jobnum;
5561 struct pipe *pi;
5562
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005563 if (!G_interactive_fd)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005564 return EXIT_FAILURE;
5565 /* If they gave us no args, assume they want the last backgrounded task */
5566 if (!argv[1]) {
Denis Vlasenko87a86552008-07-29 19:43:10 +00005567 for (pi = G.job_list; pi; pi = pi->next) {
5568 if (pi->jobid == G.last_jobid) {
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005569 goto found;
5570 }
5571 }
5572 bb_error_msg("%s: no current job", argv[0]);
5573 return EXIT_FAILURE;
5574 }
5575 if (sscanf(argv[1], "%%%d", &jobnum) != 1) {
5576 bb_error_msg("%s: bad argument '%s'", argv[0], argv[1]);
5577 return EXIT_FAILURE;
5578 }
Denis Vlasenko87a86552008-07-29 19:43:10 +00005579 for (pi = G.job_list; pi; pi = pi->next) {
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005580 if (pi->jobid == jobnum) {
5581 goto found;
5582 }
5583 }
5584 bb_error_msg("%s: %d: no such job", argv[0], jobnum);
5585 return EXIT_FAILURE;
5586 found:
5587 // TODO: bash prints a string representation
5588 // of job being foregrounded (like "sleep 1 | cat")
Denis Vlasenko34d4d892009-04-04 20:24:37 +00005589 if (argv[0][0] == 'f') {
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005590 /* Put the job into the foreground. */
Denis Vlasenko60b392f2009-04-03 19:14:32 +00005591 tcsetpgrp(G_interactive_fd, pi->pgrp);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005592 }
5593
5594 /* Restart the processes in the job */
Denis Vlasenko9af22c72008-10-09 12:54:58 +00005595 debug_printf_jobs("reviving %d procs, pgrp %d\n", pi->num_cmds, pi->pgrp);
5596 for (i = 0; i < pi->num_cmds; i++) {
5597 debug_printf_jobs("reviving pid %d\n", pi->cmds[i].pid);
5598 pi->cmds[i].is_stopped = 0;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005599 }
Denis Vlasenko9af22c72008-10-09 12:54:58 +00005600 pi->stopped_cmds = 0;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005601
5602 i = kill(- pi->pgrp, SIGCONT);
5603 if (i < 0) {
5604 if (errno == ESRCH) {
5605 delete_finished_bg_job(pi);
5606 return EXIT_SUCCESS;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005607 }
Denis Vlasenko34d4d892009-04-04 20:24:37 +00005608 bb_perror_msg("kill (SIGCONT)");
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005609 }
5610
Denis Vlasenko34d4d892009-04-04 20:24:37 +00005611 if (argv[0][0] == 'f') {
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005612 remove_bg_job(pi);
5613 return checkjobs_and_fg_shell(pi);
5614 }
5615 return EXIT_SUCCESS;
5616}
5617#endif
5618
5619#if ENABLE_HUSH_HELP
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00005620static int builtin_help(char **argv UNUSED_PARAM)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005621{
5622 const struct built_in_command *x;
5623
Denis Vlasenko34d4d892009-04-04 20:24:37 +00005624 printf("\n"
5625 "Built-in commands:\n"
5626 "------------------\n");
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005627 for (x = bltins; x != &bltins[ARRAY_SIZE(bltins)]; x++) {
5628 printf("%s\t%s\n", x->cmd, x->descr);
5629 }
5630 printf("\n\n");
5631 return EXIT_SUCCESS;
5632}
5633#endif
5634
5635#if ENABLE_HUSH_JOB
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00005636static int builtin_jobs(char **argv UNUSED_PARAM)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005637{
5638 struct pipe *job;
5639 const char *status_string;
5640
Denis Vlasenko87a86552008-07-29 19:43:10 +00005641 for (job = G.job_list; job; job = job->next) {
Denis Vlasenko9af22c72008-10-09 12:54:58 +00005642 if (job->alive_cmds == job->stopped_cmds)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005643 status_string = "Stopped";
5644 else
5645 status_string = "Running";
5646
5647 printf(JOB_STATUS_FORMAT, job->jobid, status_string, job->cmdtext);
5648 }
5649 return EXIT_SUCCESS;
5650}
5651#endif
5652
Denis Vlasenkoa60f84e2008-07-05 09:18:54 +00005653static int builtin_pwd(char **argv UNUSED_PARAM)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005654{
5655 puts(set_cwd());
5656 return EXIT_SUCCESS;
5657}
5658
5659static int builtin_read(char **argv)
5660{
5661 char *string;
5662 const char *name = argv[1] ? argv[1] : "REPLY";
Denis Vlasenkoa0e65122009-04-05 23:39:14 +00005663//TODO: check that argv[1] is a valid variable name
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005664
5665 string = xmalloc_reads(STDIN_FILENO, xasprintf("%s=", name), NULL);
Denis Vlasenko0bb4a232009-04-05 01:42:59 +00005666 return set_local_var(string, 0, 0);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005667}
5668
Mike Frysingerad88d5a2009-03-28 13:44:51 +00005669/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#set
5670 * built-in 'set' handler
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +00005671 * SUSv3 says:
Mike Frysingerad88d5a2009-03-28 13:44:51 +00005672 * set [-abCefhmnuvx] [-o option] [argument...]
5673 * set [+abCefhmnuvx] [+o option] [argument...]
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +00005674 * set -- [argument...]
5675 * set -o
5676 * set +o
5677 * Implementations shall support the options in both their hyphen and
5678 * plus-sign forms. These options can also be specified as options to sh.
5679 * Examples:
5680 * Write out all variables and their values: set
5681 * Set $1, $2, and $3 and set "$#" to 3: set c a b
5682 * Turn on the -x and -v options: set -xv
5683 * Unset all positional parameters: set --
5684 * Set $1 to the value of x, even if it begins with '-' or '+': set -- "$x"
5685 * Set the positional parameters to the expansion of x, even if x expands
5686 * with a leading '-' or '+': set -- $x
5687 *
Mike Frysingerad88d5a2009-03-28 13:44:51 +00005688 * So far, we only support "set -- [argument...]" and some of the short names.
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +00005689 */
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005690static int builtin_set(char **argv)
5691{
Denis Vlasenko424f79b2009-03-22 14:23:34 +00005692 int n;
5693 char **pp, **g_argv;
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +00005694 char *arg = *++argv;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005695
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +00005696 if (arg == NULL) {
Denis Vlasenko424f79b2009-03-22 14:23:34 +00005697 struct variable *e;
Denis Vlasenko87a86552008-07-29 19:43:10 +00005698 for (e = G.top_var; e; e = e->next)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005699 puts(e->varstr);
Denis Vlasenko424f79b2009-03-22 14:23:34 +00005700 return EXIT_SUCCESS;
Denis Vlasenko11fb7cf2009-03-20 10:13:08 +00005701 }
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005702
Mike Frysingerad88d5a2009-03-28 13:44:51 +00005703 do {
5704 if (!strcmp(arg, "--")) {
5705 ++argv;
5706 goto set_argv;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00005707 }
Mike Frysingerad88d5a2009-03-28 13:44:51 +00005708
5709 if (arg[0] == '+' || arg[0] == '-') {
5710 for (n = 1; arg[n]; ++n)
Denis Vlasenkod5762932009-03-31 11:22:57 +00005711 if (set_mode(arg[0], arg[n]))
Mike Frysingerad88d5a2009-03-28 13:44:51 +00005712 goto error;
5713 continue;
5714 }
5715
5716 break;
Denis Vlasenko424f79b2009-03-22 14:23:34 +00005717 } while ((arg = *++argv) != NULL);
5718 /* Now argv[0] is 1st argument */
5719
Mike Frysingerad88d5a2009-03-28 13:44:51 +00005720 /* Only reset global_argv if we didn't process anything */
5721 if (arg == NULL)
5722 return EXIT_SUCCESS;
5723 set_argv:
5724
Denis Vlasenko424f79b2009-03-22 14:23:34 +00005725 /* NB: G.global_argv[0] ($0) is never freed/changed */
5726 g_argv = G.global_argv;
5727 if (G.global_args_malloced) {
5728 pp = g_argv;
5729 while (*++pp)
5730 free(*pp);
5731 g_argv[1] = NULL;
5732 } else {
5733 G.global_args_malloced = 1;
5734 pp = xzalloc(sizeof(pp[0]) * 2);
5735 pp[0] = g_argv[0]; /* retain $0 */
5736 g_argv = pp;
5737 }
5738 /* This realloc's G.global_argv */
5739 G.global_argv = pp = add_strings_to_strings(g_argv, argv, /*dup:*/ 1);
5740
5741 n = 1;
5742 while (*++pp)
5743 n++;
5744 G.global_argc = n;
5745
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005746 return EXIT_SUCCESS;
Mike Frysingerad88d5a2009-03-28 13:44:51 +00005747
5748 /* Nothing known, so abort */
5749 error:
5750 bb_error_msg("set: %s: invalid option", arg);
5751 return EXIT_FAILURE;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005752}
5753
5754static int builtin_shift(char **argv)
5755{
5756 int n = 1;
5757 if (argv[1]) {
5758 n = atoi(argv[1]);
5759 }
Denis Vlasenko87a86552008-07-29 19:43:10 +00005760 if (n >= 0 && n < G.global_argc) {
Denis Vlasenkoe1300f62009-03-22 11:41:18 +00005761 if (G.global_args_malloced) {
5762 int m = 1;
5763 while (m <= n)
5764 free(G.global_argv[m++]);
5765 }
Denis Vlasenko87a86552008-07-29 19:43:10 +00005766 G.global_argc -= n;
Denis Vlasenkoe1300f62009-03-22 11:41:18 +00005767 memmove(&G.global_argv[1], &G.global_argv[n+1],
5768 G.global_argc * sizeof(G.global_argv[0]));
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005769 return EXIT_SUCCESS;
5770 }
5771 return EXIT_FAILURE;
5772}
5773
5774static int builtin_source(char **argv)
5775{
5776 FILE *input;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005777
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005778 if (*++argv == NULL)
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005779 return EXIT_FAILURE;
5780
5781 /* XXX search through $PATH is missing */
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005782 input = fopen_or_warn(*argv, "r");
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005783 if (!input) {
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005784 /* bb_perror_msg("%s", *argv); - done by fopen_or_warn */
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005785 return EXIT_FAILURE;
5786 }
5787 close_on_exec_on(fileno(input));
5788
5789 /* Now run the file */
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005790//TODO:
Denis Vlasenko87a86552008-07-29 19:43:10 +00005791 /* XXX argv and argc are broken; need to save old G.global_argv
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005792 * (pointer only is OK!) on this stack frame,
Denis Vlasenko87a86552008-07-29 19:43:10 +00005793 * set G.global_argv=argv+1, recurse, and restore. */
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005794 parse_and_run_file(input);
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005795 fclose(input);
Denis Vlasenkob6e65562009-04-03 16:49:04 +00005796 return G.last_return_code;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005797}
5798
5799static int builtin_umask(char **argv)
5800{
5801 mode_t new_umask;
5802 const char *arg = argv[1];
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005803 if (arg) {
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005804//TODO: umask may take chmod-like symbolic masks
Mike Frysinger40b8dc42009-03-29 00:50:30 +00005805 new_umask = bb_strtou(arg, NULL, 8);
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005806 if (errno) {
5807 //Message? bash examples:
5808 //bash: umask: 'q': invalid symbolic mode operator
5809 //bash: umask: 999: octal number out of range
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005810 return EXIT_FAILURE;
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005811 }
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005812 } else {
5813 new_umask = umask(0);
5814 printf("%.3o\n", (unsigned) new_umask);
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005815 /* fall through and restore new_umask which we set to 0 */
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005816 }
5817 umask(new_umask);
5818 return EXIT_SUCCESS;
5819}
5820
Mike Frysingerd690f682009-03-30 06:50:54 +00005821/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#unset */
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005822static int builtin_unset(char **argv)
5823{
Mike Frysingerd690f682009-03-30 06:50:54 +00005824 int ret;
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005825 char var;
Mike Frysingerd690f682009-03-30 06:50:54 +00005826
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005827 if (!*++argv)
Mike Frysingerd690f682009-03-30 06:50:54 +00005828 return EXIT_SUCCESS;
5829
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005830 var = 'v';
5831 if (argv[0][0] == '-') {
5832 switch (argv[0][1]) {
5833 case 'v':
5834 case 'f':
5835 var = argv[0][1];
5836 break;
Mike Frysingerd690f682009-03-30 06:50:54 +00005837 default:
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005838 bb_error_msg("unset: %s: invalid option", *argv);
Mike Frysingerd690f682009-03-30 06:50:54 +00005839 return EXIT_FAILURE;
5840 }
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005841//TODO: disallow "unset -vf ..." too
5842 argv++;
Mike Frysingerd690f682009-03-30 06:50:54 +00005843 }
5844
5845 ret = EXIT_SUCCESS;
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005846 while (*argv) {
5847 if (var == 'v') {
5848 if (unset_local_var(*argv)) {
5849 /* unset <nonexistent_var> doesn't fail.
5850 * Error is when one tries to unset RO var.
5851 * Message was printed by unset_local_var. */
Mike Frysingerd690f682009-03-30 06:50:54 +00005852 ret = EXIT_FAILURE;
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005853 }
Mike Frysingerd690f682009-03-30 06:50:54 +00005854 }
5855#if ENABLE_HUSH_FUNCTIONS
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005856 else {
5857 unset_local_func(*argv);
5858 }
Mike Frysingerd690f682009-03-30 06:50:54 +00005859#endif
Denis Vlasenkobfbc9712009-04-06 12:04:42 +00005860 argv++;
Mike Frysingerd690f682009-03-30 06:50:54 +00005861 }
5862 return ret;
Denis Vlasenkoc7985b72008-06-17 05:43:38 +00005863}
Denis Vlasenkobcb25532008-07-28 23:04:34 +00005864
Mike Frysinger56bdea12009-03-28 20:01:58 +00005865/* http://www.opengroup.org/onlinepubs/9699919799/utilities/wait.html */
5866static int builtin_wait(char **argv)
5867{
5868 int ret = EXIT_SUCCESS;
Denis Vlasenko7566bae2009-03-31 17:24:49 +00005869 int status, sig;
Mike Frysinger56bdea12009-03-28 20:01:58 +00005870
Denis Vlasenko7566bae2009-03-31 17:24:49 +00005871 if (*++argv == NULL) {
5872 /* Don't care about wait results */
5873 /* Note 1: must wait until there are no more children */
5874 /* Note 2: must be interruptible */
5875 /* Examples:
5876 * $ sleep 3 & sleep 6 & wait
5877 * [1] 30934 sleep 3
5878 * [2] 30935 sleep 6
5879 * [1] Done sleep 3
5880 * [2] Done sleep 6
5881 * $ sleep 3 & sleep 6 & wait
5882 * [1] 30936 sleep 3
5883 * [2] 30937 sleep 6
5884 * [1] Done sleep 3
5885 * ^C <-- after ~4 sec from keyboard
5886 * $
5887 */
5888 sigaddset(&G.blocked_set, SIGCHLD);
5889 sigprocmask(SIG_SETMASK, &G.blocked_set, NULL);
5890 while (1) {
5891 checkjobs(NULL);
5892 if (errno == ECHILD)
5893 break;
5894 /* Wait for SIGCHLD or any other signal of interest */
5895 /* sigtimedwait with infinite timeout: */
5896 sig = sigwaitinfo(&G.blocked_set, NULL);
5897 if (sig > 0) {
5898 sig = check_and_run_traps(sig);
5899 if (sig && sig != SIGCHLD) { /* see note 2 */
5900 ret = 128 + sig;
5901 break;
5902 }
5903 }
5904 }
5905 sigdelset(&G.blocked_set, SIGCHLD);
5906 sigprocmask(SIG_SETMASK, &G.blocked_set, NULL);
5907 return ret;
5908 }
Mike Frysinger56bdea12009-03-28 20:01:58 +00005909
Denis Vlasenko7566bae2009-03-31 17:24:49 +00005910 /* This is probably buggy wrt interruptible-ness */
Denis Vlasenkod5762932009-03-31 11:22:57 +00005911 while (*argv) {
5912 pid_t pid = bb_strtou(*argv, NULL, 10);
Mike Frysinger40b8dc42009-03-29 00:50:30 +00005913 if (errno) {
Denis Vlasenkod5762932009-03-31 11:22:57 +00005914 /* mimic bash message */
5915 bb_error_msg("wait: '%s': not a pid or valid job spec", *argv);
Mike Frysinger56bdea12009-03-28 20:01:58 +00005916 return EXIT_FAILURE;
Denis Vlasenkod5762932009-03-31 11:22:57 +00005917 }
5918 if (waitpid(pid, &status, 0) == pid) {
Mike Frysinger56bdea12009-03-28 20:01:58 +00005919 if (WIFSIGNALED(status))
5920 ret = 128 + WTERMSIG(status);
5921 else if (WIFEXITED(status))
5922 ret = WEXITSTATUS(status);
Denis Vlasenkod5762932009-03-31 11:22:57 +00005923 else /* wtf? */
Mike Frysinger56bdea12009-03-28 20:01:58 +00005924 ret = EXIT_FAILURE;
5925 } else {
Denis Vlasenkod5762932009-03-31 11:22:57 +00005926 bb_perror_msg("wait %s", *argv);
Mike Frysinger56bdea12009-03-28 20:01:58 +00005927 ret = 127;
5928 }
Denis Vlasenkod5762932009-03-31 11:22:57 +00005929 argv++;
Mike Frysinger56bdea12009-03-28 20:01:58 +00005930 }
5931
5932 return ret;
5933}
5934
Denis Vlasenkodadfb492008-07-29 10:16:05 +00005935#if ENABLE_HUSH_LOOPS
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +00005936static int builtin_break(char **argv)
Denis Vlasenkobcb25532008-07-28 23:04:34 +00005937{
Denis Vlasenko87a86552008-07-29 19:43:10 +00005938 if (G.depth_of_loop == 0) {
Denis Vlasenko4f504a92008-07-29 19:48:30 +00005939 bb_error_msg("%s: only meaningful in a loop", argv[0]);
Denis Vlasenkofcf37c32008-07-29 11:37:15 +00005940 return EXIT_SUCCESS; /* bash compat */
5941 }
Denis Vlasenko87a86552008-07-29 19:43:10 +00005942 G.flag_break_continue++; /* BC_BREAK = 1 */
5943 G.depth_break_continue = 1;
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +00005944 if (argv[1]) {
Denis Vlasenko87a86552008-07-29 19:43:10 +00005945 G.depth_break_continue = bb_strtou(argv[1], NULL, 10);
5946 if (errno || !G.depth_break_continue || argv[2]) {
Denis Vlasenko4f504a92008-07-29 19:48:30 +00005947 bb_error_msg("%s: bad arguments", argv[0]);
Denis Vlasenko87a86552008-07-29 19:43:10 +00005948 G.flag_break_continue = BC_BREAK;
5949 G.depth_break_continue = UINT_MAX;
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +00005950 }
5951 }
Denis Vlasenko87a86552008-07-29 19:43:10 +00005952 if (G.depth_of_loop < G.depth_break_continue)
5953 G.depth_break_continue = G.depth_of_loop;
Denis Vlasenkobcb25532008-07-28 23:04:34 +00005954 return EXIT_SUCCESS;
5955}
5956
Denis Vlasenko6a2d40f2008-07-28 23:07:06 +00005957static int builtin_continue(char **argv)
Denis Vlasenkobcb25532008-07-28 23:04:34 +00005958{
Denis Vlasenko4f504a92008-07-29 19:48:30 +00005959 G.flag_break_continue = 1; /* BC_CONTINUE = 2 = 1+1 */
5960 return builtin_break(argv);
Denis Vlasenkobcb25532008-07-28 23:04:34 +00005961}
Denis Vlasenkodadfb492008-07-29 10:16:05 +00005962#endif